Update pyflakes to 2.4.0#365

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

pyup-update-pyflakes-2.1.1-to-2.4.0joaogarciadelima/libpythonpro:pyup-update-pyflakes-2.1.1-to-2.4.0Copy head branch name to clipboard