更新开源库到pods上时报CocoaPods was not a

yong:EScience dfb$ pod update

Update all pods

Updating local specs repositories

[!] 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`

更新本地库，直接使用：

pod repo update --verbose

更新时间有点耗时，我等了15分钟左右