Update tox to 3.14.3

[pyup-bot]

This PR updates tox from 3.14.2 to 3.14.3.

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

Links

• PyPI: https://pypi.org/project/tox
• Docs: http://tox.readthedocs.org

[codecov]

Codecov Report

Merging #248 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #248   +/-   ##
========================================
  Coverage    73.45%   73.45%           
========================================
  Files           70       70           
  Lines         2788     2788           
========================================
  Hits          2048     2048           
  Misses         740      740

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