Update virtualenv to 20.16.5#1976

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

pyup-update-virtualenv-20.4.6-to-20.16.5kragniz/python-etcd3:pyup-update-virtualenv-20.4.6-to-20.16.5Copy head branch name to clipboard