Fix mypy

[ewjoachim]

Mypy is broken due to new version. Fixing.

Successful PR Checklist:

• Tests (units, integration, 100% coverage)
  • (not applicable?)
• Documentation
  • (not applicable?)
• Had a good time contributing?

[codecov]

Codecov Report

Merging #193 (313fbb8) into master (77fa101) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #193   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          970       970           
  Branches       127       127           
=========================================
  Hits           970       970           

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