Update attrs to 21.1.0#331

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

pyup-update-attrs-19.3.0-to-21.1.0joaogarciadelima/libpythonpro:pyup-update-attrs-19.3.0-to-21.1.0Copy head branch name to clipboard