Update tox to 4.15.1#2512

pyup-bot wants to merge 1 commit intomasterkragniz/python-etcd3:masterfrom

pyup-update-tox-3.23.1-to-4.15.1kragniz/python-etcd3:pyup-update-tox-3.23.1-to-4.15.1Copy head branch name to clipboard