Record release in changelog

Author: oli-obk

CHANGELOG.md

@@ -9,6 +9,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+### Fixedw
+
+### Changed
+
+### Removed
+
+## [0.22.0] - 2024-01-24
+
+### Added
+
 * Started maintaining a changelog
 * `Config::comment_defaults` allows setting `//@` comments for all tests
 * `//~` comments can now specify just an error code or lint name, without any message. ERROR level is implied