Update CHANGELOG.md

Author: gkjohnson

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - CameraTransitionManager: Expose "alpha" via the change event and class member.
 - Export "TilesRendererEventMap" typescript type.
 - Add support for R3F types.
+- Add "TileFlatteningPlugin".
 
 ## [0.4.7] - 2025.03.03
 ### Added