Development: use standardised PR title prefixes?

## Background
I'd like to introduce a tool like https://github.com/executablebooks/github-activity to automate our release note generation. We already have a tool that does this, but we don't do anything special with respect to categorizing the PRs that are merged during the release cycle.

The benefit of using another tool like github-activity is twofold:
- other people are using & developing it, so we won't have to maintain our own implementation
- richer release notes - e.g. easier to find bugfixes vs features

For example, here's a generated changelog entry for 1.8.0:
<details><summary>New changelog for 1.8.0</summary>

## 1.8.0

([full changelog](https://github.com/scikit-hep/awkward/compare/952981a6...d977b04f))

### New features added

- Feat: add `after_option` argument to `ak.zip` [#1308](https://github.com/scikit-hep/awkward/pull/1308) ([@agoose77](https://github.com/agoose77))
- feat: bump cibuildwheel, add Python 3.10 [#1186](https://github.com/scikit-hep/awkward/pull/1186) ([@henryiii](https://github.com/henryiii))

### Bugs fixed

- Fix: do not increment field index for nested lists [#1303](https://github.com/scikit-hep/awkward/pull/1303) ([@agoose77](https://github.com/agoose77))
- Fix: simplify output in {Byte,Bit}MaskedArray [#1279](https://github.com/scikit-hep/awkward/pull/1279) ([@agoose77](https://github.com/agoose77))
- Fix: fix `ByteMaskedArray.simplify_optiontype()` [#1259](https://github.com/scikit-hep/awkward/pull/1259) ([@agoose77](https://github.com/agoose77))
- fix: building twice was broken [#1254](https://github.com/scikit-hep/awkward/pull/1254) ([@henryiii](https://github.com/henryiii))
- Fix: support nested option types in `ak.is_none` [#1249](https://github.com/scikit-hep/awkward/pull/1249) ([@agoose77](https://github.com/agoose77))
- Fix: support mixed array types in `NumpyLike.to_rectilinear` [#1248](https://github.com/scikit-hep/awkward/pull/1248) ([@agoose77](https://github.com/agoose77))
- Fix: drop parameters for flattened RecordArray [#1214](https://github.com/scikit-hep/awkward/pull/1214) ([@agoose77](https://github.com/agoose77))
- Fix: _pack_layout should also pack projected index arrays [#1195](https://github.com/scikit-hep/awkward/pull/1195) ([@agoose77](https://github.com/agoose77))

### Maintenance and upkeep improvements

- chore: wheel not required for setuptools PEP 517 (all-repos) [#1322](https://github.com/scikit-hep/awkward/pull/1322) ([@jpivarski](https://github.com/jpivarski))
- chore: bump pybind11 to 2.9.1 [#1316](https://github.com/scikit-hep/awkward/pull/1316) ([@henryiii](https://github.com/henryiii))
- chore: remove extra files from the wheels [#1314](https://github.com/scikit-hep/awkward/pull/1314) ([@henryiii](https://github.com/henryiii))
- ci: avoid PyPI cuda wheel upload [#1313](https://github.com/scikit-hep/awkward/pull/1313) ([@henryiii](https://github.com/henryiii))
- chore: add dependabot for actions [#1263](https://github.com/scikit-hep/awkward/pull/1263) ([@henryiii](https://github.com/henryiii))
- chore: initial nox and pylint support [#1262](https://github.com/scikit-hep/awkward/pull/1262) ([@henryiii](https://github.com/henryiii))
- chore: update pytest config, 6.0+ [#1255](https://github.com/scikit-hep/awkward/pull/1255) ([@henryiii](https://github.com/henryiii))
- chore: bump to pybind11 2.9.0 [#1199](https://github.com/scikit-hep/awkward/pull/1199) ([@henryiii](https://github.com/henryiii))
- ci: try Numba RC on 3.10 [#1188](https://github.com/scikit-hep/awkward/pull/1188) ([@henryiii](https://github.com/henryiii))
- chore: bump pybind11 to 2.8.0 [#1011](https://github.com/scikit-hep/awkward/pull/1011) ([@henryiii](https://github.com/henryiii))

### Documentation improvements

- Docs: fix typo in documentation [#1326](https://github.com/scikit-hep/awkward/pull/1326) ([@agoose77](https://github.com/agoose77))
- docs: add BioGeek as a contributor for doc [#1210](https://github.com/scikit-hep/awkward/pull/1210) ([@allcontributors](https://github.com/allcontributors))

### API and Breaking Changes

- C++ refactoring: ak.cartesian, ak.argcartesian [#1317](https://github.com/scikit-hep/awkward/pull/1317) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.sort [#1309](https://github.com/scikit-hep/awkward/pull/1309) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.argcombinations, ak.combinations [#1307](https://github.com/scikit-hep/awkward/pull/1307) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.argsort [#1304](https://github.com/scikit-hep/awkward/pull/1304) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.strings_astype [#1301](https://github.com/scikit-hep/awkward/pull/1301) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.without_parameters [#1297](https://github.com/scikit-hep/awkward/pull/1297) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.fields [#1296](https://github.com/scikit-hep/awkward/pull/1296) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak._v2.from_arrow_schema function [#1294](https://github.com/scikit-hep/awkward/pull/1294) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: ak.full_like, ak.zeros_like, ak.ones_like [#1293](https://github.com/scikit-hep/awkward/pull/1293) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.with_field [#1292](https://github.com/scikit-hep/awkward/pull/1292) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.with_parameter [#1289](https://github.com/scikit-hep/awkward/pull/1289) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: layout.completely_flatten should not concatenate (performance issue). [#1245](https://github.com/scikit-hep/awkward/pull/1245) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: ak.parameters [#1242](https://github.com/scikit-hep/awkward/pull/1242) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: getting Numba to work for v2 arrays [#1240](https://github.com/scikit-hep/awkward/pull/1240) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: ak.type and ak.values_astype [#1234](https://github.com/scikit-hep/awkward/pull/1234) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.with_name [#1233](https://github.com/scikit-hep/awkward/pull/1233) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.pad_none [#1229](https://github.com/scikit-hep/awkward/pull/1229) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: Redo PR #1227: fixing 'emptyArray' typo. [#1228](https://github.com/scikit-hep/awkward/pull/1228) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: ak.num [#1226](https://github.com/scikit-hep/awkward/pull/1226) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.zip [#1225](https://github.com/scikit-hep/awkward/pull/1225) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.ravel [#1222](https://github.com/scikit-hep/awkward/pull/1222) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.local_index [#1221](https://github.com/scikit-hep/awkward/pull/1221) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.where [#1220](https://github.com/scikit-hep/awkward/pull/1220) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: ak.mask [#1219](https://github.com/scikit-hep/awkward/pull/1219) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: Make highlevel __repr__ safe for typetracers. [#1218](https://github.com/scikit-hep/awkward/pull/1218) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: ak.flatten [#1217](https://github.com/scikit-hep/awkward/pull/1217) ([@ioanaif](https://github.com/ioanaif))
- C++ refactoring: Fixed handling of list-nested boolean slices. [#1215](https://github.com/scikit-hep/awkward/pull/1215) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: Removed v1_to_v2 from all v2 tests [#1211](https://github.com/scikit-hep/awkward/pull/1211) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: ak._v2 namespace is now filled with the right symbols. [#1208](https://github.com/scikit-hep/awkward/pull/1208) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: Highlevel non-reducers and improved testing/fixes for reducers. [#1206](https://github.com/scikit-hep/awkward/pull/1206) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: ak._v2.operations.convert.to_numpy is done. [#1204](https://github.com/scikit-hep/awkward/pull/1204) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: Don't let ak.to_list act on v2 arrays (finishing #1201). [#1203](https://github.com/scikit-hep/awkward/pull/1203) ([@jpivarski](https://github.com/jpivarski))
- C++ refactoring: Implemented v2 ak.to_list and switched all v2 tests to use it. [#1201](https://github.com/scikit-hep/awkward/pull/1201) ([@jpivarski](https://github.com/jpivarski))

### Other merged PRs

- Keep as much length knowledge as possible in typetracers. [#1312](https://github.com/scikit-hep/awkward/pull/1312) ([@jpivarski](https://github.com/jpivarski))
- Fix lost 'behavior' in 'ak.unzip'. [#1310](https://github.com/scikit-hep/awkward/pull/1310) ([@jpivarski](https://github.com/jpivarski))
- Awkward CUDA Kernel's version should be tied with Awkward [#1306](https://github.com/scikit-hep/awkward/pull/1306) ([@swishdiff](https://github.com/swishdiff))
- Implement Awkward --> C++ with Cling. [#1300](https://github.com/scikit-hep/awkward/pull/1300) ([@jpivarski](https://github.com/jpivarski))
- Remove unnecessary line blank from the tops of almost all files . [#1299](https://github.com/scikit-hep/awkward/pull/1299) ([@jpivarski](https://github.com/jpivarski))
- Allow ak.nan_to_num arguments to be arrays. [#1298](https://github.com/scikit-hep/awkward/pull/1298) ([@jpivarski](https://github.com/jpivarski))
- Fix a typo [#1290](https://github.com/scikit-hep/awkward/pull/1290) ([@douglasdavis](https://github.com/douglasdavis))
- [pre-commit.ci] pre-commit autoupdate [#1277](https://github.com/scikit-hep/awkward/pull/1277) ([@pre-commit-ci](https://github.com/pre-commit-ci))
- This PR adds support to call kernels in CUDA from v2 Awkward Arrays. [#1276](https://github.com/scikit-hep/awkward/pull/1276) ([@swishdiff](https://github.com/swishdiff))
- style: pylint 1 [#1275](https://github.com/scikit-hep/awkward/pull/1275) ([@henryiii](https://github.com/henryiii))
- Fixing #1266 by reordering nextparents (in v2; v1 is NOT FIXED!). [#1274](https://github.com/scikit-hep/awkward/pull/1274) ([@jpivarski](https://github.com/jpivarski))
- Add GHA to build CUDA Wheels and update the cuda build script [#1270](https://github.com/scikit-hep/awkward/pull/1270) ([@swishdiff](https://github.com/swishdiff))
- style: update to first non-pre-release black! [#1267](https://github.com/scikit-hep/awkward/pull/1267) ([@henryiii](https://github.com/henryiii))
- Bump pypa/gh-action-pypi-publish from 1.4.2 to 1.5.0 [#1265](https://github.com/scikit-hep/awkward/pull/1265) ([@dependabot](https://github.com/dependabot))
- Bump pypa/cibuildwheel from 1.12.0 to 2.3.1 [#1264](https://github.com/scikit-hep/awkward/pull/1264) ([@dependabot](https://github.com/dependabot))
- Remove distutils reference in test (now an error). [#1258](https://github.com/scikit-hep/awkward/pull/1258) ([@jpivarski](https://github.com/jpivarski))
- Add a CITATION.cff file to specify a set of authors. [#1257](https://github.com/scikit-hep/awkward/pull/1257) ([@jpivarski](https://github.com/jpivarski))
- style: further cleanup for Python 3.6+ [#1246](https://github.com/scikit-hep/awkward/pull/1246) ([@henryiii](https://github.com/henryiii))
- style: pyupgrade to 3.6 [#1244](https://github.com/scikit-hep/awkward/pull/1244) ([@henryiii](https://github.com/henryiii))
- style: add shellcheck [#1243](https://github.com/scikit-hep/awkward/pull/1243) ([@henryiii](https://github.com/henryiii))
- Revert "Build wheels for ppc64le" [#1239](https://github.com/scikit-hep/awkward/pull/1239) ([@jpivarski](https://github.com/jpivarski))
- Remove Windows 32-bit from the Python 3.10 build. [#1237](https://github.com/scikit-hep/awkward/pull/1237) ([@jpivarski](https://github.com/jpivarski))
- macos segfault bugfix [#1232](https://github.com/scikit-hep/awkward/pull/1232) ([@ianna](https://github.com/ianna))
- Updated the generate-cuda script. Works for py >= 3.8 [#1231](https://github.com/scikit-hep/awkward/pull/1231) ([@swishdiff](https://github.com/swishdiff))
- Build wheels for ppc64le [#1224](https://github.com/scikit-hep/awkward/pull/1224) ([@chrisburr](https://github.com/chrisburr))
- Restore pybind11 2.9.0. [#1223](https://github.com/scikit-hep/awkward/pull/1223) ([@jpivarski](https://github.com/jpivarski))
- [pre-commit.ci] pre-commit autoupdate [#1213](https://github.com/scikit-hep/awkward/pull/1213) ([@pre-commit-ci](https://github.com/pre-commit-ci))
- Drop Win32 Py3.10 test and musllinux in deployment. [#1212](https://github.com/scikit-hep/awkward/pull/1212) ([@jpivarski](https://github.com/jpivarski))
- json de-/serialisation from/to string or file [#1207](https://github.com/scikit-hep/awkward/pull/1207) ([@ianna](https://github.com/ianna))
- Better error message for Content::axis_wrap_if_negative. [#1202](https://github.com/scikit-hep/awkward/pull/1202) ([@jpivarski](https://github.com/jpivarski))
- Allow non-array iterables in __array_function__. [#1198](https://github.com/scikit-hep/awkward/pull/1198) ([@jpivarski](https://github.com/jpivarski))
- Fix ak.singletons for non-optional data. [#1197](https://github.com/scikit-hep/awkward/pull/1197) ([@jpivarski](https://github.com/jpivarski))
- Remove distutils dependence. [#1196](https://github.com/scikit-hep/awkward/pull/1196) ([@jpivarski](https://github.com/jpivarski))
- [pre-commit.ci] pre-commit autoupdate [#1194](https://github.com/scikit-hep/awkward/pull/1194) ([@pre-commit-ci](https://github.com/pre-commit-ci))
- Remove duplicated text [#1187](https://github.com/scikit-hep/awkward/pull/1187) ([@BioGeek](https://github.com/BioGeek))
- Drop all length information from TypeTracer, get all tests working again. [#1184](https://github.com/scikit-hep/awkward/pull/1184) ([@jpivarski](https://github.com/jpivarski))
- Bugs found by the Dask project: broaden type-tracers' applicability [#1183](https://github.com/scikit-hep/awkward/pull/1183) ([@jpivarski](https://github.com/jpivarski))
- Remove Python 2.7 and 3.5 support. [#1182](https://github.com/scikit-hep/awkward/pull/1182) ([@jpivarski](https://github.com/jpivarski))
- Fixed zeros in RegularArray shape. [#1181](https://github.com/scikit-hep/awkward/pull/1181) ([@jpivarski](https://github.com/jpivarski))
- ak.to_numpy with RegularArray of size zero and non-zero length. [#1180](https://github.com/scikit-hep/awkward/pull/1180) ([@jpivarski](https://github.com/jpivarski))
- Raise ValueError for incompatible union types in ak.unzip. [#1179](https://github.com/scikit-hep/awkward/pull/1179) ([@jpivarski](https://github.com/jpivarski))
- Fix leading zeros in ak.unflatten. [#1178](https://github.com/scikit-hep/awkward/pull/1178) ([@jpivarski](https://github.com/jpivarski))
- NumpyArray::numbers_to_type must use flattened_length, not length. [#1175](https://github.com/scikit-hep/awkward/pull/1175) ([@jpivarski](https://github.com/jpivarski))
- [pre-commit.ci] pre-commit autoupdate [#1174](https://github.com/scikit-hep/awkward/pull/1174) ([@pre-commit-ci](https://github.com/pre-commit-ci))
- Bugs found by the Dask project [#1172](https://github.com/scikit-hep/awkward/pull/1172) ([@jpivarski](https://github.com/jpivarski))
- Parquet files with zero record batches. [#1170](https://github.com/scikit-hep/awkward/pull/1170) ([@jpivarski](https://github.com/jpivarski))
- ArrayBuilder: replace shared with unique [#1155](https://github.com/scikit-hep/awkward/pull/1155) ([@ianna](https://github.com/ianna))
- pictures for a tutorial [#948](https://github.com/scikit-hep/awkward/pull/948) ([@ianna](https://github.com/ianna))

### Contributors to this release

([GitHub contributors page for this release](https://github.com/scikit-hep/awkward/graphs/contributors?from=2021-12-02&to=2022-03-01&type=c))

[@agoose77](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Aagoose77+updated%3A2021-12-02..2022-03-01&type=Issues) | [@allcontributors](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Aallcontributors+updated%3A2021-12-02..2022-03-01&type=Issues) | [@BioGeek](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3ABioGeek+updated%3A2021-12-02..2022-03-01&type=Issues) | [@chrisburr](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Achrisburr+updated%3A2021-12-02..2022-03-01&type=Issues) | [@codecov](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Acodecov+updated%3A2021-12-02..2022-03-01&type=Issues) | [@dependabot](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Adependabot+updated%3A2021-12-02..2022-03-01&type=Issues) | [@douglasdavis](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Adouglasdavis+updated%3A2021-12-02..2022-03-01&type=Issues) | [@henryiii](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Ahenryiii+updated%3A2021-12-02..2022-03-01&type=Issues) | [@ianna](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Aianna+updated%3A2021-12-02..2022-03-01&type=Issues) | [@ioanaif](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Aioanaif+updated%3A2021-12-02..2022-03-01&type=Issues) | [@jpivarski](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Ajpivarski+updated%3A2021-12-02..2022-03-01&type=Issues) | [@martindurant](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Amartindurant+updated%3A2021-12-02..2022-03-01&type=Issues) | [@miranov25](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Amiranov25+updated%3A2021-12-02..2022-03-01&type=Issues) | [@pre-commit-ci](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Apre-commit-ci+updated%3A2021-12-02..2022-03-01&type=Issues) | [@swishdiff](https://github.com/search?q=repo%3Ascikit-hep%2Fawkward+involves%3Aswishdiff+updated%3A2021-12-02..2022-03-01&type=Issues)


</details>

<details><summary> Existing changelog for 1.8.0</summary>


<div class="section" id="release-1-8-0">
<h2>Release <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/releases/tag/1.8.0">1.8.0</a><a class="headerlink" href="#release-1-8-0" title="Permalink to this heading">¶</a></h2>
<blockquote>
<div>(<a class="reference external" href="https://pypi.org/project/awkward/1.8.0/">pip</a>)
</div></blockquote>
(no pull requests)
</div>
<div class="section" id="release-1-8-0rc7">
<h2>Release <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/releases/tag/1.8.0rc7">1.8.0rc7</a><a class="headerlink" href="#release-1-8-0rc7" title="Permalink to this heading">¶</a></h2>
<blockquote>
<div>(<a class="reference external" href="https://pypi.org/project/awkward/1.8.0rc7/">pip</a>)
</div></blockquote>
<ul class="simple">
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1326">#1326</a>: Docs: fix typo in documentation.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1314">#1314</a>: chore: remove extra files from the wheels.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1313">#1313</a>: ci: avoid PyPI cuda wheel upload.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1316">#1316</a>: chore: bump pybind11 to 2.9.1.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1312">#1312</a>: Keep as much length knowledge as possible in typetracers.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1322">#1322</a>: chore: wheel not required for setuptools PEP 517 (all-repos)</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1317">#1317</a>: C++ refactoring: ak.cartesian, ak.argcartesian.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1301">#1301</a>: C++ refactoring: ak.strings_astype.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1308">#1308</a>: Feat: add <code class="docutils literal notranslate">optiontype_outside_record</code> argument to <code class="docutils literal notranslate">ak.zip</code></li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1307">#1307</a>: C++ refactoring: ak.argcombinations, ak.combinations.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1309">#1309</a>: C++ refactoring: ak.sort.</li>
</ul>
</div>
<div class="section" id="release-1-8-0rc6">
<h2>Release <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/releases/tag/1.8.0rc6">1.8.0rc6</a><a class="headerlink" href="#release-1-8-0rc6" title="Permalink to this heading">¶</a></h2>
<blockquote>
<div>(<a class="reference external" href="https://pypi.org/project/awkward/1.8.0rc6/">pip</a>)
</div></blockquote>
<ul class="simple">
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1310">#1310</a>: Fix lost ‘behavior’ in ‘ak.unzip’.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1300">#1300</a>: Implement Awkward –&gt; C++ with Cling.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1306">#1306</a>: Version of awkward_cuda should be tied with awkward.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1304">#1304</a>: C++ refactoring: ak.argsort.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1303">#1303</a>: Fix: do not increment field index for nested lists.</li>
</ul>
</div>
<div class="section" id="release-1-8-0rc5">
<h2>Release <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/releases/tag/1.8.0rc5">1.8.0rc5</a><a class="headerlink" href="#release-1-8-0rc5" title="Permalink to this heading">¶</a></h2>
<blockquote>
<div>(<a class="reference external" href="https://pypi.org/project/awkward/1.8.0rc5/">pip</a>)
</div></blockquote>
(no pull requests)
</div>
<div class="section" id="release-1-8-0rc4">
<h2>Release <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/releases/tag/1.8.0rc4">1.8.0rc4</a><a class="headerlink" href="#release-1-8-0rc4" title="Permalink to this heading">¶</a></h2>
<blockquote>
<div>(<a class="reference external" href="https://pypi.org/project/awkward/1.8.0rc4/">pip</a>)
</div></blockquote>
<ul class="simple">
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1299">#1299</a>: Remove unnecessary line blank from the tops of almost all files .</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1298">#1298</a>: Allow ak.nan_to_num arguments to be arrays.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1296">#1296</a>: ak.fields.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1297">#1297</a>: ak.without_parameters.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1293">#1293</a>: C++ refactoring: ak.full_like, ak.zeros_like, ak.ones_like.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1275">#1275</a>: style: pylint 1.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1274">#1274</a>: Fixing <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/issues/1266">#1266</a> (in v1 and v2), possibly by reordering nextparents.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1294">#1294</a>: C++ refactoring: ak._v2.from_arrow_schema function.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1289">#1289</a>: C++ refactoring: ak.with_parameter.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1292">#1292</a>: C++ refactoring: ak.with_field.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1290">#1290</a>: typo.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1276">#1276</a>: This PR adds support to call kernels in CUDA from v2 Awkward Arrays.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1249">#1249</a>: Fix: support nested option types in <code class="docutils literal notranslate">ak.is_none</code> (also: <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/issues/1193">#1193</a>, <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/issues/1193">#1193</a>)</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1279">#1279</a>: Fix: simplify output in {Byte,Bit}MaskedArray.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1277">#1277</a>: [pre-commit.ci] pre-commit autoupdate.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1240">#1240</a>: Getting Numba to work for v2 arrays.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1207">#1207</a>: json de-/serialisation from/to string or file.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1270">#1270</a>: Add GHA to build CUDA Wheels and update the cuda build script.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1262">#1262</a>: chore: initial nox and pylint support.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1267">#1267</a>: style: update to first non-pre-release black!</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1265">#1265</a>: Bump pypa/gh-action-pypi-publish from 1.4.2 to 1.5.0.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1257">#1257</a>: Add a .zenodo.json file to specify a set of authors.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1264">#1264</a>: Bump pypa/cibuildwheel from 1.12.0 to 2.3.1.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1263">#1263</a>: chore: add dependabot for actions.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1259">#1259</a>: Fix: fix <code class="docutils literal notranslate">ByteMaskedArray.simplify_optiontype()</code></li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1258">#1258</a>: Remove distutils reference in test (now an error).</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1255">#1255</a>: chore: update pytest config, 6.0+</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1242">#1242</a>: C++ refactoring: ak.parameters.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1243">#1243</a>: style: add shellcheck.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1254">#1254</a>: fix: building twice was broken.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1248">#1248</a>: Fix: support mixed array types in <code class="docutils literal notranslate">NumpyLike.to_rectilinear</code></li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1246">#1246</a>: style: further cleanup for Python 3.6+</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1244">#1244</a>: style: pyupgrade to 3.6.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1245">#1245</a>: layout.completely_flatten should not concatenate (performance issue).</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1234">#1234</a>: C++ refactoring: ak.type and ak.values_astype.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1214">#1214</a>: Fix: drop parameters for flattened RecordArray.</li>
</ul>
</div>
<div class="section" id="release-1-8-0rc3">
<h2>Release <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/releases/tag/1.8.0rc3">1.8.0rc3</a><a class="headerlink" href="#release-1-8-0rc3" title="Permalink to this heading">¶</a></h2>
<blockquote>
<div>(<a class="reference external" href="https://pypi.org/project/awkward/1.8.0rc3/">pip</a>)
</div></blockquote>
<ul class="simple">
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1239">#1239</a>: Revert “Build wheels for ppc64le (<a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/issues/1224">#1224</a>)”</li>
</ul>
</div>
<div class="section" id="release-1-8-0rc2">
<h2>Release <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/releases/tag/1.8.0rc2">1.8.0rc2</a><a class="headerlink" href="#release-1-8-0rc2" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1233">#1233</a>: C++ refactoring: ak.with_name.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1231">#1231</a>: Updated the generate-cuda script. Works for py &gt;= 3.8.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1224">#1224</a>: Build wheels for ppc64le.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1237">#1237</a>: Remove Windows 32-bit from the Python 3.10 build.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1229">#1229</a>: C++ refactoring: ak.pad_none.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1232">#1232</a>: macos segfault bugfix.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1225">#1225</a>: C++ refactoring: ak.zip.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1228">#1228</a>: Redo PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/issues/1227">#1227</a>: fixing ‘emptyArray’ typo.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1226">#1226</a>: C++ refactoring: ak.num.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1217">#1217</a>: C++ refactoring: ak.flatten.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1220">#1220</a>: C++ refactoring: ak.where.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1223">#1223</a>: Restore pybind11 2.9.0.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1218">#1218</a>: Make highlevel __repr__ safe for typetracers.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1219">#1219</a>: C++ refactoring: ak.mask.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1221">#1221</a>: C++ refactoring: ak.local_index.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1222">#1222</a>: C++ refactoring: ak.ravel.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1211">#1211</a>: Removed v1_to_v2 from all v2 tests. (also: <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/issues/962">#962</a>)</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1215">#1215</a>: Fixed handling of list-nested boolean slices.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1212">#1212</a>: Drop Win32 Py3.10 test and musllinux in deployment.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1213">#1213</a>: [pre-commit.ci] pre-commit autoupdate.</li>
</ul>
</div>
<div class="section" id="release-1-8-0rc1">
<h2>Release <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/releases/tag/1.8.0rc1">1.8.0rc1</a><a class="headerlink" href="#release-1-8-0rc1" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1188">#1188</a>: ci: try Numba RC on 3.10.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1199">#1199</a>: chore: bump to pybind11 2.9.0.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1210">#1210</a>: docs: add BioGeek as a contributor for doc.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1208">#1208</a>: ak._v2 namespace is now filled with the right symbols.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1206">#1206</a>: Highlevel non-reducers and improved testing/fixes for reducers.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1204">#1204</a>: ak._v2.operations.convert.to_numpy is done.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1203">#1203</a>: Don’t let ak.to_list act on v2 arrays (finishing <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/issues/1201">#1201</a>).</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1202">#1202</a>: Better error message for Content::axis_wrap_if_negative.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1201">#1201</a>: Implemented v2 ak.to_list and switched all v2 tests to use it.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1198">#1198</a>: Allow non-array iterables in __array_function__.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1197">#1197</a>: Fix ak.singletons for non-optional data.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1196">#1196</a>: Remove distutils dependence.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1195">#1195</a>: Fix: _pack_layout should also pack projected index arrays.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1194">#1194</a>: [pre-commit.ci] pre-commit autoupdate.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/948">#948</a>: pictures for a tutorial.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1155">#1155</a>: ArrayBuilder: replace shared with unique.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1011">#1011</a>: chore: bump pybind11 to 2.8.0.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1186">#1186</a>: feat: bump cibuildwheel, add Python 3.10.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1187">#1187</a>: Remove duplicated text.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1184">#1184</a>: Drop all length information from TypeTracer, get all tests working again.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1183">#1183</a>: Bugs found by the Dask project: broaden type-tracers’ applicability.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1172">#1172</a>: First bug found by @martindurant.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1182">#1182</a>: Remove Python 2.7 and 3.5 support.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1181">#1181</a>: Fixed zeros in RegularArray shape.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1175">#1175</a>: NumpyArray::numbers_to_type must use flattened_length, not length.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1180">#1180</a>: ak.to_numpy with RegularArray of size zero and non-zero length.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1179">#1179</a>: Raise ValueError for incompatible union types in ak.unzip.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1178">#1178</a>: Fix leading zeros in ak.unflatten.</li>
<li>PR <a class="reference external" href="https://github.com/scikit-hep/awkward-1.0/pull/1174">#1174</a>: [pre-commit.ci] pre-commit autoupdate.</li>
</ul>
</div>
</div>

</details>

## Discussion
In order to produce richer release notes, we would benefit from using a standard set of prefixes for our PR titles. Really, we could do this for commits too, but as we squash and merge, it's really an aside for the purposes of this discussion. Some examples of these standards:

- https://github.com/conventional-changelog/commitlint/tree/master/%40commitlint/config-conventional 
- https://github-activity.readthedocs.io/en/latest/#id1

It really doesn't matter what we choose here, so long as we are all following some kind of convention. We don't even need to use the same convention (although this is really recommended).

I could write a small action to validate the PR title before merge if that would be helpful to enforce this. I hope that, given we only need to do this at merge time, it should minimally impact us during development.

Thoughts?

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Development: use standardised PR title prefixes? #1577

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Development: use standardised PR title prefixes? #1577

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