git-flow 是一个 git 扩展集，在有git环境的基础上还需要下载git-flow扩展
安装扩展
Linux apt-get install git-flow macOS brew install git-flow-avh windows wget -q -O - --no-check-certificate https://raw.github.com/petervanderdoes/gitflow-avh/develop/contrib/gitflow-installer.sh install stable | bash
原文链接：https://danielkummer.github.io/git-flow-cheatsheet/index.zh_CN.html