Update rubygems on travis
Update rubygems on travis

andrew/contribulator,andrew/contribulator,wadtech/contribulator,jasnow/contribulator,jasnow/contribulator,jasnow/contribulator,24pullrequests/contribulator,24pullrequests/contribulator,wadtech/contribulator,wadtech/contribulator,24pullrequests/contribulator,andrew/contribulator