Update codecov to 2.0.16

[pyup-bot]

This PR updates codecov from 2.0.15 to 2.0.16.

Changelog

2.0.16

- fixed reported command injection vulnerability.

Links

• PyPI: https://pypi.org/project/codecov
• Changelog: https://pyup.io/changelogs/codecov/
• Repo: https://github.com/codecov/codecov-python

[codecov-io]

Codecov Report

Merging #85 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #85   +/-   ##
=======================================
  Coverage   78.13%   78.13%           
=======================================
  Files           5        5           
  Lines         247      247           
=======================================
  Hits          193      193           
  Misses         54       54

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[pyup-bot]

Closing this in favor of #89