Update README.md file.
Update README.md file.

Signed-off-by: shines77 <c816ee361b8bcaf7cf19d627e3bc89a63016b2b4@msn.com>

gamedev2/cocos2d-x-2.2,gamedev2/cocos2d-x-2.2,gamedev2/cocos2d-x-2.2,gamedev2/cocos2d-x-2.2,gamedev2/cocos2d-x-2.2,gamedev2/cocos2d-x-2.2