Docs update.

Author: photonstorm

README.md

@@ -350,6 +350,7 @@ You can read all about the philosophy behind Lazer [here](http://phaser.io/news/
 * You can now access the intensity of the Camera shake effect via the getter / setter `Camera.shakeIntensity`. Useful if you wish to tween the intensity while running. (thanks @drhayes #2443)
 * The Arcade Physics overlap method would return false if two bodies were overlapping but neither had any velocity (i.e. they were embedded into each other)
 * PIXI.defaultRenderer is now set to `null` in Game.destroy, allowing it to be reset if a new Game instance is created on the same page (thanks @xtforgame ##2474)
+* BitmapData.drawGroupProxy is now capable of iterating through Sprites that have children, and also now uses the world positions for drawing instead. This change updates the functionality of BitmapData.drawGroup.
 
 ### Bug Fixes