git flow

http://www.ruanyifeng.com/blog/2012/07/git.html

https://www.cnblogs.com/lcngu/p/5770288.html

https://www.centos.bz/2018/08/%E5%9C%A8%E5%9B%A2%E9%98%9F%E4%B8%AD%E4%BD%BF%E7%94%A8gitlab%E4%B8%AD%E7%9A%84merge-request%E5%B7%A5%E4%BD%9C%E6%A8%A1%E5%BC%8F/