CocoaPods 更新慢的问题

可以先从国内镜像源下载，然后更改库的地址

$ cd ~/.cocoapods/repo
$ git clone https://gitee.com/mirrors/CocoaPods-Specs.git master # 2021/03/10 测试可用
$ cd master
$ git remote set-url origin https://github.com/CocoaPods/Specs.git