问题：升级AndroidStudio2.x To 3.x时，

Sync时警告：build.gradle: API ‘variant.getMergeAssets()‘ is obsolete and has been replaced with ‘variant.getMergeAssetsProvider()‘.

解决：

改变
variant.mergeAssets.doLast {
为：
variant.mergeAssetsProvider.get().doLast {

cocos2d-build.gradle: API 'variant.getMergeAssets()' is obsolete and has been replaced with 'variant.getMergeAssetsProvider()'.