Update isort to 4.3.10

[pyup-bot]

This PR updates isort from 4.3.9 to 4.3.10.

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

Links

• PyPI: https://pypi.org/project/isort
• Changelog: https://pyup.io/changelogs/isort/
• Repo: https://github.com/timothycrosley/isort

[codecov]

Codecov Report

Merging #588 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #588   +/-   ##
=======================================
  Coverage   95.65%   95.65%           
=======================================
  Files          55       55           
  Lines        2856     2856           
=======================================
  Hits         2732     2732           
  Misses        124      124

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