Update mypy to 0.660

[pyup-bot]

This PR updates mypy from 0.650 to 0.660.

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[bot]]

Codecov Report

Merging #10 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #10   +/-   ##
======================================
  Coverage    21.4%   21.4%           
======================================
  Files          76      76           
  Lines        2107    2107           
  Branches      181     181           
======================================
  Hits          451     451           
  Misses       1655    1655           
  Partials        1       1

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Continue to review full report at Codecov.

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[coveralls]

Pull Request Test Coverage Report for Build 125

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 18.325%

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Totals
Change from base Build 118:	0.0%
Covered Lines:	452
Relevant Lines:	2107

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💛 - Coveralls

[pyup-bot]

Closing this in favor of #12