Update pytest to 6.0.1

[pyup-bot]

This PR updates pytest from 5.4.3 to 6.0.1.

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

Links

• PyPI: https://pypi.org/project/pytest
• Homepage: https://docs.pytest.org/en/latest/

[codecov]

Codecov Report

Merging #229 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   94.89%   94.89%           
=======================================
  Files          25       25           
  Lines        1666     1666           
=======================================
  Hits         1581     1581           
  Misses         85       85           

---

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 5e70dfd...fb69134. Read the comment docs.