Require Py3.7-dev travis builds to pass by now (it's in beta).
Require Py3.7-dev travis builds to pass by now (it's in beta).

da-woods/cython,scoder/cython,scoder/cython,scoder/cython,da-woods/cython,da-woods/cython,da-woods/cython,scoder/cython,cython/cython,cython/cython,cython/cython,cython/cython