Lacking CocoaPods support

[duemunk]

CocoaPods support has been missing for a long time (#29, #124, and more), and last time I gave it a shot, CocoaPods didn't play nice. I don't use it, so I'm considering just removing support for it completely.

Any thoughts? cc @colemcampbell @Coledunsby

[colemcampbell]

In my experience Swift packages are significantly easier to create and maintain, and now that Xcode 11 includes built-in SwiftPM support I don’t see any reason to use CocoaPods in my own projects. I’ve had to keep it around for dependencies that haven’t adopted SwiftPM compatibility yet but that number is shrinking rapidly and I imagine that it’s only a matter of time before I never use CocoaPods again.

[colemcampbell]

@duemunk If you decide to drop support and want someone to take care of removing it from the repository I can make a pull request.

[duemunk]

Thanks for offering @colemcampbell. I think we should do that then!