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