Update changelog

Author: andreacorbellini

CHANGELOG.md

@@ -1,5 +1,36 @@
 # Changelog
 
+## atomic-write-file 0.2.0
+
+### New features
+
+* Added the `AtomicWriteFile::directory` method to allow accessing the
+  file descriptor of the parent directory, without making any system call (this
+  method is available on all platforms, but it has a meaningful implementation
+  only on Unix).
+
+### Unix changes
+
+* Updated dependency on `nix` to version 0.29.
+
+* Sync the parent directory after committing or discarding the temporary file
+  (via `fsync(2)`). This ensures that changes are persisted and not rolled-back
+  if a crash occurs.
+
+  In the previous releases, syncing the directory was intended to be a step
+  that had to be explicitly performed by the caller *if* they wanted this
+  behavior, and it was intentionally left out as a performance improvement for
+  those callers that did not care about changes being persisted. However we do
+  realize that callers may not be aware of the importance of this step, hence
+  now it's done automatically.
+
+### Breaking changes
+
+* The `unnamed-tmpfile` is now disabled by default and needs to be explicitly
+  enabled with `features = ["unnamed-tmpfile"]` in `Cargo.toml`. This decision
+  was made to better support processes that run early at boot, and filesystems
+  that have poor support for anonymous temporary files.
+
 ## atomic-write-file 0.1.4
 
 ### Linux changes