update version number

Author: pfefferle

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Dev
+## 4.2.0 - 2024-11-15
 
 ### Added
 
@@ -1063,6 +1063,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * initial
 
+[4.2.0]: https://github.com/Automattic/wordpress-activitypub/compare/4.1.1...4.2.0
 [4.1.1]: https://github.com/Automattic/wordpress-activitypub/compare/4.1.0...4.1.1
 [4.1.0]: https://github.com/Automattic/wordpress-activitypub/compare/4.0.2...4.1.0
 [4.0.2]: https://github.com/Automattic/wordpress-activitypub/compare/4.0.1...4.0.2