cygwin 中 git 命令自动完成 auto completion

cygwin 中 git 命令自动完成 auto completion
参考：http://stackoverflow.com/questions/18722835/cygwin-git-tab-completion

从cygwin安装git-completion

或者，命令行安装：

To install “git-completion” package run from cmd.exe:

cyg-get git-completion

You don’t need to modify your .bashrc after that.