Update devpi-client to 6.0.3#76

pyup-bot wants to merge 1 commit intomasterluzfcb/docker-devpi-nginx:masterfrom

pyup-update-devpi-client-5.2.2-to-6.0.3luzfcb/docker-devpi-nginx:pyup-update-devpi-client-5.2.2-to-6.0.3Copy head branch name to clipboard