Update readme.txt
Fixed bug

Fixed crash multi actions, TTFLabel in cocos2d-x 3.1rc0
Update readme.txt
fixed 3.0 & 3.1 api
Merge pull request #3 from beckheng/develop

fixed 3.0 & 3.1 api
update lib for cocos2d-x 3.1 & 3.0
Macro to create loader class
Merge pull request #4 from beckheng/develop

Macro to create loader class