Deprecate Python 3.6, add support for Python 3.10 and add mypy optionally.

[tobiasraabe]

Committed via https://github.com/asottile/all-repos

[codecov]

Codecov Report

Merging #9 (e208c28) into main (dd518b5) will increase coverage by 7.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   89.88%   97.22%   +7.33%     
==========================================
  Files           3        2       -1     
  Lines          89       72      -17     
==========================================
- Hits           80       70      -10     
+ Misses          9        2       -7     

Flag	Coverage Δ
end_to_end	97.22% <ø> (+7.33%)	⬆️

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Impacted Files	Coverage Δ
...slug}}/src/{{cookiecutter.project_slug}}/config.py	75.00% <ø> (ø)
{{cookiecutter.project_slug}}/pyproject.toml

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