Update Travis CI ruby versions
Update Travis CI ruby versions

jreinert/yard,herosky/yard,herosky/yard,ohai/yard,amclain/yard,thomthom/yard,iankronquist/yard,lsegal/yard,lsegal/yard,alexdowad/yard,amclain/yard,jreinert/yard,jreinert/yard,thomthom/yard,amclain/yard,alexdowad/yard,herosky/yard,lsegal/yard,thomthom/yard,iankronquist/yard,alexdowad/yard,ohai/yard,ohai/yard,iankronquist/yard