Readme updated.

Author: photonstorm

README.md

@@ -203,6 +203,7 @@ We've also removed functions and properties from Pixi classes that Phaser doesn'
 * Animation.update skips ahead frames when the system is lagging, however it failed to set the animation to the final frame in the sequence if the animation skipped ahead too far (thanks @richpixel #1628)
 * Loader.preloadSprite had an extra guard added to ensure it didn't try to updateCrop a non-existent sprite (thanks @noidexe #1636)
 * The `TilemapParser` has had its row / column calculations updated to account for margins and and spacing on all sides of the tileset (thanks @zekoff #1642)
+* Any Tile set with alpha !== 1 would cause the whole layer to render incorrectly (thanks @nkholski #1666)
 
 ### Pixi 2.2.7 Bug Fixes