cocoapods 1.7.2版本后CDN为默认值
使用1.8，CocoaPods不再需要克隆现在巨大的主规格repo才能运行，用户几乎可以立即将他们的项目与CocoaPods集成。
编辑Podfile以将CDN设置为主要来源：
source 'https://cdn.cocoapods.org/'
cocoapods报错 [!] Couldn't determine repo type for URL: `https://cdn.cocoapods.org/`: execution expired
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