Seen on https://github.com/sickill/rainbow/commit/30904393e61844304abc0f9f00226497fc1b8201 ```yml matrix: include: - rvm: 2.0.0 ... - rvm: 2.2.6 install: true # This skips 'bundle install' script: gem build rainbow && gem install *.gem ```