Use -munittest instead of setup.py test to run tests

[yakky]

Description

The support for latter invocation method will be removed at some point from setuptools

References

Fix #29

Checklist

• [x] Code lint checked via inv lint
• [ ] Tests added

[coveralls]

Pull Request Test Coverage Report for Build 1375424457

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 92.52%

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Totals
Change from base Build 1375331442:	-0.03%
Covered Lines:	188
Relevant Lines:	200

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💛 - Coveralls

[yakky]

wrong branch name