[!] Failed to connect to GitHub

[!] Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please check if you are offline, or that GitHub is down
原答案如下：
https://stackoverflow.com/questions/38993527/cocoapods-failed-to-connect-to-github-to-update-the-cocoapods-specs-specs-repo/48962041#48962041