items设置

https://www.cnblogs.com/xishuai/p/mac-iterm2.html

https://github.com/lenxeon/notes/tree/master/%E8%BF%90%E7%BB%B4/201510/iterm2%E5%92%8Coh-my-zsh%E5%AE%89%E8%A3%85%E4%BB%A5%E5%8F%8A%E4%BD%BF%E7%94%A8%E4%BB%8B%E7%BB%8D