Change Rx to a peer dependency instead of an outright dependency.
Change Rx to a peer dependency instead of an outright dependency.

Without this change, the patches that we make to Rx may or may not be available to client code, depending on a race condition on module loading.

Better to have just one copy of Rx floating around, I think.

tangledfruit/rxjs-to-async-iterator,tangledfruit/rx-to-async-iterator