Allow Python 2 testing failures in Travis CI (#2615)
Allow Python 2 testing failures in Travis CI (#2615)

* Allow Python 2 build to fail in travis.ci

* Use the --check flag for black

dask/distributed,mrocklin/distributed,dask/distributed,blaze/distributed,dask/distributed,mrocklin/distributed,mrocklin/distributed,dask/distributed,blaze/distributed