trigger tests using python setup.py test

[shenek]

This patch will allow you to run test using python setup.py test command.

See https://docs.pytest.org/en/latest/goodpractices.html#integrating-with-setuptools-python-setup-py-test-pytest-runner

[codecov-io]

Codecov Report

Merging #97 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #97 +/- ##
=======================================
Coverage 93.58% 93.58% =======================================
Files 13 13 Lines 998 998 =======================================
Hits 934 934 Misses 64 64

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[mpdavis]

lgtm