Update pyflakes to 2.3.0#314

pyup-bot wants to merge 2 commits intomasterjoaogarciadelima/libpythonpro:masterfrom

pyup-update-pyflakes-2.1.1-to-2.3.0joaogarciadelima/libpythonpro:pyup-update-pyflakes-2.1.1-to-2.3.0Copy head branch name to clipboard