升級Xode導致CocoaPods不可用，升級CocoaPods解決

由於升級了Xcode9，導致CocoaPods安裝第三方庫的時候報錯，RuntimeError - [Xcodeproj] Unknown object version. 提示內容： Search for existing GitHub issues similar to yours: https://github.com/CocoaPods/CocoaPods/search?q=%5BXcode

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