Update CHANGELOG.md

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - `manager` field to `TilesRenderer` to enable support for DRACO decompression.
+- `TilesRenderer.onLoadTileSet` callback function.
 
 ### Fixed