update release note
[AUTO]: updating luabinding automatically
update release note
Update RELEASE_NOTES.md
Merge pull request #7483 from minggo/update-release-note

[ci skip]Update release note
Merge pull request #7482 from CocosRobot/update_lua_bindings_1405577434

[AUTO]: updating luabinding automatically
[AUTO][ci skip]: updating cocos2dx_files.json
Merge pull request #7484 from CocosRobot/update_cocosfiles_1405578501

[AUTO][ci skip]: updating cocos2dx_files.json
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3_hot_fix