Update codecov to 2.1.3

[pyup-bot]

This PR updates codecov from 2.0.16 to 2.1.3.

Changelog

2.0.21

- fixed string issues

2.0.20

- fixed broken subprocess handling

2.0.19

- fixed broken subprocess handling

2.0.18

- fixed broken subprocess handling

2.0.17

- 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]

Codecov Report

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

@@            Coverage Diff            @@
##            master       #97   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          397       397           
=========================================
  Hits           397       397           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9bb7e5d...c2b1a5e. Read the comment docs.

[pyup-bot]

Closing this in favor of #101