Remove fail-under directive from Travis.
Remove fail-under directive from Travis.

This is just not necessary right now while we're still in rapid
development.

bhavishyagopesh/hyper-h2,python-hyper/hyper-h2,Kriechi/hyper-h2,vladmunteanu/hyper-h2,vladmunteanu/hyper-h2,python-hyper/hyper-h2,Kriechi/hyper-h2,mhils/hyper-h2