Update pytest-runner to 5.3.0

[pyup-bot]

This PR updates pytest-runner from 5.2 to 5.3.0.

Changelog

5.3.0

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* Require Python 3.6 or later.
* Refreshed package metadata.

Links

• PyPI: https://pypi.org/project/pytest-runner
• Changelog: https://pyup.io/changelogs/pytest-runner/
• Repo: https://github.com/pytest-dev/pytest-runner/

[codecov-io]

Codecov Report

Merging #125 (a12fc83) into master (9c7e512) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #125   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         1172      1172           
=========================================
  Hits          1172      1172           

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[pyup-bot]

Closing this in favor of #168