[cocos2d-objc] Updated README and CHANGELOG

CHANGELOG.md

@@ -44,6 +44,7 @@
 
 ### Cocos2d-Objc
  * Fixed renderer to work with 3.6 changes
+ * Added support for two color tinting. Tinting is enabled/disabled per `SkeletonRenderer/SkeletonAnimation.twoColorTint = true`. Note that two color tinted skeletons do not batch with other nodes.
 
 ### SFML
  * Fixed renderer to work with 3.6 changes. Sadly, two color tinting does not work, as the vertex format in SFML is fixed.

spine-cocos2d-objc/README.md

@@ -10,7 +10,7 @@ The Spine Runtimes are developed with the intent to be used with data exported f
 
 ## Spine version
 
-spine-cocos2d-objc works with data exported from Spine 3.5.xx.
+spine-cocos2d-objc works with data exported from Spine 3.6.x.
 
 spine-cocos2d-objc supports all Spine features.
 
@@ -29,6 +29,9 @@ See the [Spine Runtimes documentation](http://esotericsoftware.com/spine-documen
 
 The Spine cocos2d-objc example works on iOS simulators and devices.
 
+## Notes
+* To enable two color tinting, set `SkeletonRenderer.twoColorTint = true`. Note that skeletons rendered with this feature will not batch with other skeletons.
+
 ### iOS
 1. Install [Xcode](https://developer.apple.com/xcode/)
 2. Install [Homebrew](http://brew.sh/)