Add proxywriter about mpb HOT 3 CLOSED

Hello!
Thanks for pointing to io.ReadFrom, indeed it wasn't accounted for. Commit 9436aa1 should fix this. If you have time and interest to implement a proxy for writer side, I'd be glad to review a PR.
You mentioned sftp.File which is a good use case for proxy reader, can you think of any use case for proxy writer?

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I've done this externally in a library I wrote to wrap mpb. Most relavant parts:
are here: https://github.com/nektro/go-util/blob/master/mbpp/mbpp.go#L144
and here: https://github.com/nektro/go-util/blob/master/mbpp/headlessbar.go

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I think the title of the issue is a bit misleading, because @donny-dont asked for io.WriterTo interface to be implemented, so that io.Copy can benefit, if used with internal proxy reader. As this is done I'm closing this issue.

@nektro thanks for interesting code, anyway.

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