Remove Carthage directory #415
                
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I have noticed that when using SwiftPM, Xcode will resolve and download RxSwift twice. This is because it is listed both as a dependency in the Package.swift and also as a git submodule in .gitmodules.
For Carthage to resolve correctly I don't believe the submodule needs to be checked in, but I can try to find another solution if it is required.