Update .travis.yml
Update .travis.yml

Why does travis fail in 3.4? Trying in python 3.6
AaronWatters/inferelator_ng,simonsfoundation/inferelator_ng,simonsfoundation/inferelator_ng,AaronWatters/inferelator_ng,simonsfoundation/inferelator_ng,AaronWatters/inferelator_ng