Fixed google parser when using literals. Bumped mypy version

[jepperaskdk]

Fixes:

• https://github.com/jepperaskdk/pydoctest/issues/41

[codecov[bot]]

Codecov Report

Merging #42 (5655647) into main (cb50d60) will increase coverage by 0.12%. The diff coverage is 75.00%.

:exclamation: Current head 5655647 differs from pull request most recent head 9bbfc2d. Consider uploading reports for the commit 9bbfc2d to get more accurate results

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   93.15%   93.27%   +0.12%     
==========================================
  Files          13       13              
  Lines         716      714       -2     
  Branches      117      118       +1     
==========================================
- Hits          667      666       -1     
+ Misses         34       32       -2     
- Partials       15       16       +1     

Impacted Files	Coverage Δ
pydoctest/reporters/text_reporter.py	92.85% <50.00%> (+1.94%)	:arrow_up:
pydoctest/parsers/google_parser.py	93.90% <100.00%> (ø)
pydoctest/version.py	100.00% <100.00%> (ø)

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