Update gunicorn to 20.0.2#35

pyup-bot wants to merge 1 commit intomasterfloatingman/pythontdd:masterfrom

pyup-update-gunicorn-19.8.1-to-20.0.2floatingman/pythontdd:pyup-update-gunicorn-19.8.1-to-20.0.2Copy head branch name to clipboard