Update flake8 to 3.9.0#135

pyup-bot wants to merge 1 commit intomastertilaboy/easy-tokenizer:masterfrom

pyup-update-flake8-3.7.8-to-3.9.0tilaboy/easy-tokenizer:pyup-update-flake8-3.7.8-to-3.9.0Copy head branch name to clipboard