Add bumpversion for releases

Author: konradkonrad

.bumpversion.cfg

@@ -0,0 +1,13 @@
+[bumpversion]
+current_version = 0.4.2
+commit = True
+tag = True
+message = Release {new_version}
+
+[bumpversion:file:Dockerfile]
+search = ENV RELEASE_TAG v{current_version}
+replace = ENV RELEASE_TAG v{new_version}
+
+[bumpversion:file:archlinux/PKGBUILD]
+search = {current_version}
+replace = {new_version}

README.md

@@ -30,3 +30,14 @@ $ du -h solc soltest
 3.0M    solc
 5.8M    soltest
 ```
+
+## Create a release
+
+Use [bumpversion](https://github.com/peritus/bumpversion) to bump version strings to newest upstream version, then push
+the newly created commit and tag:
+
+```bash
+# Example from 0.4.2 -> 0.4.3
+bumpversion patch
+git push && git push --tags
+```