卡在Cloning spec repo cocoapods from git@github.com:CocoaPods/Specs.git
pod setup
cd ~/.cocoapods/repos
git clone --depth 1 https://github.com/CocoaPods/Specs.git master
如果报错：
error: RPC failed; curl 18 transfer closed with outstanding read data remaining
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
解决方法：
git config --global http.postBuffer 524288000
