Update protobuf to 3.12.0#1165

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

pyup-update-protobuf-3.6.1-to-3.12.0kragniz/python-etcd3:pyup-update-protobuf-3.6.1-to-3.12.0Copy head branch name to clipboard