ci testing with python 2.7

[perrygeo]

Having some issues with py27 on travis. Passes in py36. Both work in local venv.

INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/main.py", line 84, in wrap_session
INTERNALERROR>     doit(config, session)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/main.py", line 122, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 413, in __call__
INTERNALERROR>     return self._docall(methods, kwargs)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 424, in _docall
INTERNALERROR>     res = mc.execute()
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 315, in execute
INTERNALERROR>     res = method(**kwargs)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/main.py", line 142, in pytest_runtestloop
INTERNALERROR>     item.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 413, in __call__
INTERNALERROR>     return self._docall(methods, kwargs)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 424, in _docall
INTERNALERROR>     res = mc.execute()
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 315, in execute
INTERNALERROR>     res = method(**kwargs)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/runner.py", line 65, in pytest_runtest_protocol
INTERNALERROR>     runtestprotocol(item, nextitem=nextitem)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/runner.py", line 72, in runtestprotocol
INTERNALERROR>     rep = call_and_report(item, "setup", log)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/runner.py", line 111, in call_and_report
INTERNALERROR>     report = hook.pytest_runtest_makereport(item=item, call=call)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/main.py", line 167, in call_matching_hooks
INTERNALERROR>     return hookmethod.pcall(plugins, **kwargs)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 417, in pcall
INTERNALERROR>     return self._docall(methods, kwargs)
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 424, in _docall
INTERNALERROR>     res = mc.execute()
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/_pytest/core.py", line 325, in execute
INTERNALERROR>     fin()
INTERNALERROR>   File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/hypothesis/extra/pytestplugin.py", line 93, in pytest_runtest_makereport
INTERNALERROR>     report = (yield).get_result()
INTERNALERROR> AttributeError: 'NoneType' object has no attribute 'get_result'