Update codecov to 2.1.3

[pyup-bot]

This PR updates codecov from 2.0.22 to 2.1.3.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

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

[codecov]

Codecov Report

Merging #346 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #346   +/-   ##
========================================
  Coverage    81.34%   81.34%           
========================================
  Files           72       72           
  Lines         2776     2776           
========================================
  Hits          2258     2258           
  Misses         518      518           

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