Add pip caching for travis
Add pip caching for travis

massgo/league,massgo/league,MattClarke131/league,MattClarke131/league,hwchen/league,hndrewaall/league,hndrewaall/league,massgo/league,hwchen/league,hndrewaall/league,hndrewaall/league,hwchen/league,hwchen/league,MattClarke131/league,MattClarke131/league,massgo/league