Update CHANGELOG-v3.50.md

Author: photonstorm

CHANGELOG-v3.50.md

@@ -4,11 +4,14 @@
 
 ### Updates
 
+* `Layer.destroy` will now call `destroy` on all of its children as well.
+
 ### Bug Fixes
 
 * On some keyboards it was possible for the `keyup` event to not fire because it was filtered out by the Keyboard Plugin repeat key check. Fix #5472 (thanks @cjw6k)
 * Fixed issue causing `Cannot read property 'pipelines' of null` to be thrown if using 3.50 with the HEADLESS renderer. Fix #5468 (thanks @Grenagar)
 * Canvas Tilemap Rendering is now working again. Fix #5480 (thanks @marshmn)
+* `Layer.destroy` will now emit the `DESTROY` event at the start of the method. Fix #5466 (thanks @samme)
 
 ### Examples, Documentation and TypeScript