修改brew源

# 替换brew.git:

step1:

cd "$(brew --repo)"

step2:

git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git

step3:

cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"

step4:

git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git

step5:

echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.tuna.tsinghua.edu.cn/homebrew-bottles' >> ~/.bash_profile

step6:

 source ~/.bash_profile

step7:

brew update