Update mypy to 0.701

[pyup-bot]

This PR updates mypy from 0.700 to 0.701.

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

Links

• PyPI: https://pypi.org/project/mypy
• Homepage: http://www.mypy-lang.org/

[codecov]

Codecov Report

Merging #994 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #994   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines         422    422           
  Branches       10     10           
=====================================
  Hits          422    422

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