升級Xcode9.3後 cocoapods 無法使用的解決辦法
### Error
```
RuntimeError - [Xcodeproj] Unknown object version.
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/xcodeproj-1.4.2/lib/xcodeproj/project.rb:217:in `initialize_from_file'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/xcodeproj-1.4.2/lib/xcodeproj/project.rb:102:in `open'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:851:in `block (2 levels) in inspect_targets_to_integrate'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:850:in `each'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:850:in `block in inspect_targets_to_integrate'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/user_interface.rb:64:in `section'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:845:in `inspect_targets_to_integrate'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:66:in `analyze'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:236:in `analyze'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:150:in `block in resolve_dependencies'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/user_interface.rb:64:in `section'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:149:in `resolve_dependencies'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:110:in `install!'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/command/install.rb:37:in `run'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/claide-1.0.1/lib/claide/command.rb:334:in `run'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/lib/cocoapods/command.rb:52:in `run'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/gems/cocoapods-1.2.0/bin/pod:55:in `<top (required)>'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/bin/pod:23:in `load'
/Users/junyangyang/.rvm/gems/ruby-2.2.2@global/bin/pod:23:in `<main>'
```
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[!] Oh no, an error occurred.
Search for existing GitHub issues similar to yours:
https://github.com/CocoaPods/CocoaPods/search?q=%5BXcodeproj%5D+Unknown+object+version.&type=Issues
If none exists, create a ticket, with the template displayed above, on:
https://github.com/CocoaPods/CocoaPods/issues/new
Be sure to first read the contributing guide for details on how to properly submit a ticket:
https://github.com/CocoaPods/CocoaPods/blob/master/CONTRIBUTING.md
Don't forget to anonymize any private data!
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