CHANGELOG.md: Add entry for PR #390

Signed-off-by: Andrew Gunnerson <[email protected]>

CHANGELOG.md

@@ -12,6 +12,7 @@
 * Switch to using zerocopy library for all binary file format parsers ([PR #384])
 * Update to latest AOSP protobuf schema for the `payload.bin` metadata file format ([PR #385])
 * Update dependencies and pin Github Actions actions to specific commits ([PR #386])
+* Improve error messages from file format parsers ([PR #390])
 
 ### Version 3.9.0
 
@@ -405,3 +406,4 @@ Behind-the-scenes changes:
 [PR #384]: https://github.com/chenxiaolong/avbroot/pull/384
 [PR #385]: https://github.com/chenxiaolong/avbroot/pull/385
 [PR #386]: https://github.com/chenxiaolong/avbroot/pull/386
+[PR #390]: https://github.com/chenxiaolong/avbroot/pull/390