Latest Swift 2.0 release for iOS, OS X, tvOS & watchOS
• Xcode 7.1 beta (7B60) or higher is required to build for OS X and tvOS.
• Xcode 7.0 GM (7A218) or higher (but not Xcode 7.1 beta) is required to build for watchOS.
• Xcode 7.0 or 7.1 beta can be used to build for iOS.