Update codecov to 2.1.7

[pyup-bot]

This PR updates codecov from 2.1.6 to 2.1.7.

Changelog

2.1.7

- [279](https://github.com/codecov/codecov-python/pull/279) Fix pinned coverage version

Links

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

[codecov]

Codecov Report

Merging #373 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #373   +/-   ##
========================================
  Coverage    81.45%   81.45%           
========================================
  Files           72       72           
  Lines         2810     2810           
========================================
  Hits          2289     2289           
  Misses         521      521           

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