Homebrew 切换源

https://lug.ustc.edu.cn/wiki/mirrors/help/brew.git

```shell script

替换brew.git:

cd “$(brew –repo)” git remote set-url origin https://mirrors.ustc.edu.cn/brew.git

替换homebrew-core.git:

cd “$(brew –repo)/Library/Taps/homebrew/homebrew-core” git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git ```