changelog update for today's release

CHANGELOG.md

@@ -4,7 +4,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased](https://github.com/at-gmbh/personio-py/compare/v0.2.2...HEAD)
+## [Unreleased](https://github.com/at-gmbh/personio-py/compare/v0.2.3...HEAD)
+
+...
+
+## [0.2.3](https://github.com/at-gmbh/personio-py/tree/v0.2.3) - 2023-05-05
 
 * add support for Projects ([#36](https://github.com/at-gmbh/personio-py/pull/36))
 * add support for attendances, with paginated API requests ([#35](https://github.com/at-gmbh/personio-py/pull/35))