[TIP] Coverage.py 4.0.1

[Ned Batchelder]

A fix release with nine fixes to coverage.py 4.0.

Changes: 
https://coverage.readthedocs.org/en/coverage-4.0.1/changes.html#changes-401

Kits: https://pypi.python.org/pypi/coverage/4.0.1

--Ned.