Update CHANGELOG.md

Author: photonstorm

CHANGELOG.md

@@ -146,6 +146,8 @@ Notes:
 * The InputPlugin will now dispatch an update event regardless, allowing the Gamepad Plugin to update itself every frame, regardless of OM events. This allows Gamepads to work correctly again. Fix #4414 (thanks @CipSoft-Components)
 * Calling `Tween.play` on a tween that had already finished and was pending removal will stop the tween from getting stuck in an `isPlaying` state and will restart the tween again from the beginning. Calling `play` on a Tween that is already playing does nothing. Fix #4184 (thanks @SamCode)
 * Declared `Audio.dataset`, which fixes Internet Explorer 10 crashing when trying to access the dataset property of the object (thanks @SirLink)
+* Previously, setting a mask on a Particle Emitter wouldn't work (it had to be set on the Emitter Manager instance), even though the mask methods and properties existed. You can now set a geometry or bitmap mask directly on an emitter.
+* The Particle Emitter Manager was missing the Mask component, even though it fully supported masking. The Mask component has now been added. You can now mask the manager, which impacts all emitters you create through it, or a specific emitter. Different emitters can have different masks, although they override the parent mask, if set.
 
 ### Examples, Documentation and TypeScript