默认镜像源在github上，国内可更新为中科大源，速度非常快

# 替换 brew
cd "$(brew --repo)"
git remote set-url origin https://mirrors.ustc.edu.cn/brew.git
# 替换 homebrew-cor
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git
# 替换 homebrew-cask
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-cask"
git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-cask.git
# 重新执行
brew update