Update flake8 to 3.4.0#37

pyup-bot wants to merge 1 commit intomasterdchaplinsky/aiohttp_validate:masterfrom

pyup-update-flake8-3.2.1-to-3.4.0dchaplinsky/aiohttp_validate:pyup-update-flake8-3.2.1-to-3.4.0Copy head branch name to clipboard