Combine support

[sindresorhus]

Would be nice to support Combine for the observation API here. This should be in addition to the observation API, not replacing it.

https://developer.apple.com/documentation/combine/receiving_and_handling_events_with_combine

The code should be fully documented, tests added, and documented in the readme too.

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This issue requires you to have advanced Swift knowledge and have studied the Combine docs.

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[sindresorhus]

Combine will be out tomorrow. So this we can do this then. I'm thinking we could expose the publisher as Defaults.publisher(for: .someKey, options: [.initial, .new]).

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[benkoska]

I would love to work on this. Can you assign me?

[sindresorhus]

Sure :)

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