Make lint tests in travis run with python 3.6
Make lint tests in travis run with python 3.6

nzlosh/st2,nzlosh/st2,Plexxi/st2,StackStorm/st2,nzlosh/st2,Plexxi/st2,nzlosh/st2,StackStorm/st2,Plexxi/st2,Plexxi/st2,StackStorm/st2,StackStorm/st2