Update flake8 to 3.9.2

[pyup-bot]

This PR updates flake8 from 3.9.0 to 3.9.2.

Changelog

### 3.9.2 ``` ------------------- You can view the `3.9.2 milestone`_ on GitHub for more details. Bugs Fixed ~~~~~~~~~~ - Fix error message for ``E111`` in ``pycodestyle`` (See also :pull:`1328`, :issue:`1327`). Deprecations ~~~~~~~~~~~~ - ``indent_size_str`` is deprecated, use ``str(indent_size)`` instead (See also :pull:`1328`, :issue:`1327`). .. all links .. _3.9.2 milestone: https://github.com/PyCQA/flake8/milestone/40 ``` ### 3.9.1 ``` ------------------- You can view the `3.9.1 milestone`_ on GitHub for more details. Bugs Fixed ~~~~~~~~~~ - Fix codes being ignored by plugins utilizing ``extend_default_ignore`` (See also :pull:`1317`) .. all links .. _3.9.1 milestone: https://github.com/PyCQA/flake8/milestone/38 ```

Links

- PyPI: https://pypi.org/project/flake8 - Changelog: https://pyup.io/changelogs/flake8/ - Repo: https://gitlab.com/pycqa/flake8

[codecov[bot]]

Codecov Report

Merging #238 (49c3c35) into master (af5eaf9) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 49c3c35 differs from pull request most recent head d0aa877. Consider uploading reports for the commit d0aa877 to get more accurate results

@@           Coverage Diff           @@
##           master     #238   +/-   ##
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  Coverage   52.61%   52.61%           
=======================================
  Files          24       24           
  Lines        1627     1627           
=======================================
  Hits          856      856           
  Misses        771      771           

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