Bump pyflakes from 2.1.1 to 2.2.0 (#9)

Bumps [pyflakes](https://github.com/PyCQA/pyflakes) from 2.1.1 to 2.2.0.
- [Release notes](https://github.com/PyCQA/pyflakes/releases)
- [Changelog](https://github.com/PyCQA/pyflakes/blob/master/NEWS.rst)
- [Commits](https://github.com/PyCQA/pyflakes/compare/2.1.1...2.2.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements.txt

@@ -27,7 +27,7 @@ psutil==5.7.0
 py==1.8.1
 py-cpuinfo==6.0.0
 pycodestyle==2.5.0
-pyflakes==2.1.1
+pyflakes==2.2.0
 pylint==2.4.4
 pyparsing==2.4.7
 pytest==5.4.1