swift 使用cocopod配置格式，Mark一下。

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# Uncomment this line to define a global platform for your project
platform :ios, '9.0'
# Comment this line if you're not using Swift and don't want to use dynamic frameworks
use_frameworks!

target 'TestDemo' do

pod 'Alamofire', '~> 4.0.1'
pod 'Kingfisher', '~> 3.1.1'

end