cocoapods not be updated，May be due to damage caused local database，We can go directly to CocoaPods local directory manually update it：
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~/.cocoapods/repos/master git pull git checkout master |
And then return to the implementation of the project to normal under update .
Original article written by Gerber drop-off：R0uter's Blog » CocoaPods was not able to update the `master` repo.
Reproduced Please keep the source and description link：https://www.logcg.com/archives/3051.html
