Update CHANGELOG.md

Author: GrahamCampbell

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [11.12.0] - 2023-10-XX
 
 * Add PHP 8.3 support
+* Add support for `environment_scope` in `Project::removeVariable`
+* Add support for `author` in `Repositories::commits`
 
 ## [11.11.1] - 2023-10-XX