Run unit tests and integration tests against Python 3.6 and Python 3.8
Run unit tests and integration tests against Python 3.6 and Python 3.8

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