推送私有源的方法:
pod spec lint GPFoundation.podspec --sources='https://github.com/YanweiLi/GPSpecs.git,https://github.com/CocoaPods/Specs.git' --verbose --allow-warnings
pod repo push GPSpecs GPFoundation.podspec --sources='https://github.com/YanweiLi/GPSpecs.git,https://github.com/CocoaPods/Specs.git' --verbose --allow-warnings