Update flake8 to 4.0.0#261

pyup-bot wants to merge 1 commit intomasterAl1rios/libpythonpro:masterfrom

pyup-update-flake8-3.5.0-to-4.0.0Al1rios/libpythonpro:pyup-update-flake8-3.5.0-to-4.0.0Copy head branch name to clipboard