Change Travis CI ruby version from 2.1.0 to 2.1.1
Change Travis CI ruby version from 2.1.0 to 2.1.1

treble37/pronto,prontolabs/pronto,mvz/pronto,jhass/pronto,HaiTo/pronto,aergonaut/pronto,gussan/pronto,Zauberstuhl/pronto,mmozuras/pronto