Update podspec.
Update podspec.

iosyoujian/SwiftTask,luzefeng/SwiftTask,marinehero/SwiftTask,marinehero/SwiftTask,ReactKit/SwiftTask,luzefeng/SwiftTask,ReactKit/SwiftTask,luzefeng/SwiftTask,msdgwzhy6/SwiftTask,iosyoujian/SwiftTask,msdgwzhy6/SwiftTask,iosyoujian/SwiftTask,msdgwzhy6/SwiftTask,msdgwzhy6/SwiftTask,iosyoujian/SwiftTask,luzefeng/SwiftTask,ReactKit/SwiftTask,marinehero/SwiftTask,marinehero/SwiftTask