fix:Update RELEASE_NOTES.md
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop_new_fix
Merge pull request #5526 from samuele3hu/develop_new_fix

fix: Update the RELEASE_NOTES.md
[Jenkins] fix the url of repos
Merge pull request #5529 from lmskater/fix-repos-url

[Jenkins] fix the url of repos
change environment variable name from NDK_ROOT1 to NDK_ROOT
Merge pull request #5530 from minggo/install

change environment variable name from NDK_ROOT1 to NDK_ROOT
Merge branch 'develop' into fast_tmx