Added Spleeter.io to the list of "Other providers" in readme.

[brobbins2001]

I implemented demucs into a web page meant to act as an interface for spleeter, and now demucs. See it at: https://www.spleeter.io/demucs

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[adefossez]

Thanks a lot @brobbins2001 :)

[adefossez]

One note: for faster separation, you can use individual models in particular for the Extra models, e.g. -n e51eebcc for instance. It will be 4 time faster but obviously a bit worse.