cd to root project and run following command
curl https://gist.githubusercontent.com/edwinwong90/e14f1d767fd42338789ee4f437cb8eab/raw/5e28bdb779815e207fd07940573b3840ba3abfc6/gitflow-extend-cli.sh > gitflow-extend-cli.sh && chmod 755 gitflow-extend-cli.sh