Update flake8 to 3.7.3#27

pyup-bot wants to merge 1 commit intomasteralinik/soroush-python-sdk:masterfrom

pyup-update-flake8-3.6.0-to-3.7.3alinik/soroush-python-sdk:pyup-update-flake8-3.6.0-to-3.7.3Copy head branch name to clipboard