Update mypy to 0.730

[pyup-bot]

This PR updates mypy from 0.670 to 0.730.

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

@@           Coverage Diff           @@
##           master     #185   +/-   ##
=======================================
  Coverage   76.08%   76.08%           
=======================================
  Files           9        9           
  Lines         322      322           
  Branches       37       37           
=======================================
  Hits          245      245           
  Misses         68       68           
  Partials        9        9

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[pyup-bot]

Closing this in favor of #189