brew install太慢的解决办法

1. 更新源

# 替换 brew.git 源（清华）
git -C "$(brew --repo)" remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git# 替换 homebrew-core.git 源（清华）
git -C "$(brew --repo homebrew/core)" remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git# 替换 homebrew-cask 仓库的源（清华）
git -C "$(brew --repo homebrew/cask)" remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-cask.git

2. update一下

brew update