Ubuntu18.04配置shadowsocks

参考：

https://blog.csdn.net/blessLZH0108/article/details/80396486

https://linghucong.js.org/2016/04/20/setup-Shadowsocks-on-ubuntu-1604/

https://blog.csdn.net/junmuzi/article/details/75266331

https://blog.csdn.net/u013360850/article/details/78016914

https://blog.csdn.net/u013360850/article/details/78016914