Update pytest to 5.4.3

[pyup-bot]

This PR updates pytest from 5.3.5 to 5.4.3.

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

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   72.04%   72.04%           
=======================================
  Files          25       25           
  Lines        1631     1631           
=======================================
  Hits         1175     1175           
  Misses        456      456           

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