[!] CocoaPods was not able to update the `master` repo.

问题

执行命令
​​​pod repo update --verbose​​​ 后
一直报错：
​​​[!] CocoaPods was not able to update the `master` repo. If this is an unexpected issue and persists you can inspect it running `pod repo update --verbose​​

解决方案一： 升级 ​​ruby​​​ 到最新版本，再执行命令，OK！
升级命令：
​​​brew install ruby​​

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