Run Tox tests

fix: use `is` for comparison against `None` #30

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Run time

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Job	Run time
Tox test (py27)	46s
Tox test (py36)	49s
Tox test (py37)	33s
Tox test (py38)	42s
Tox test (py39)	43s
Tox test (py310)	43s
Tox test (pypy2)	42s
Tox test (pypy3)	49s
Tox test (pep8)	42s
	6m 29s