拉取工程代码，pod install 之后报了如下错误：
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[!] Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please check if you are offline, or that GitHub is down
无奈我都准备重装 CocoaPods 了，最后抱着试一试的想法，更新了一下 CocoaPods 工程，还真的好了，具体操作如下：
cd ~/.cocoapods/repos/cocoapods
git pull
待 CocoaPods 完成更新，再更新工程就可以了：
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