Configure travis to build only stable branches and tags (#9132)
Configure travis to build only stable branches and tags (#9132)

* Configure travis to build only stable branches and tags

* Also consider RC and milestone tags

* Update .travis.yml

Co-Authored-By: marcospereira <cf5bc8317261a285b80eabcd42732dac229416a9@gmail.com>

mkurz/playframework,marcospereira/playframework,playframework/playframework,wegtam/playframework,wegtam/playframework,benmccann/playframework,playframework/playframework,playframework/playframework,mkurz/playframework,marcospereira/playframework,wegtam/playframework,marcospereira/playframework,benmccann/playframework,benmccann/playframework,wegtam/playframework,mkurz/playframework,mkurz/playframework,benmccann/playframework,marcospereira/playframework