Fix python-version on ci

[ewjoachim]

Checklist:

• [ ] Tests
  • [ ] (not applicable?)
• [ ] Documentation
  • [ ] (not applicable?)

[codecov[bot]]

Codecov Report

Merging #45 (db571aa) into master (71f887c) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #45   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          148       148           
  Branches        11        11           
=========================================
  Hits           148       148           

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