Update tox to 3.5.1#127

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

pyup-update-tox-2.5.0-to-3.5.1dchaplinsky/aiohttp_validate:pyup-update-tox-2.5.0-to-3.5.1Copy head branch name to clipboard