Mention pbs3 as an alternative for Windows?

[twardoch]

The Readme and docs say that Windows is not supported by sh — which is true, and I unde the rationale.

sh evolved from pbs, and more there is a fork of pbs called pbs3 ( https://github.com/xapple/pbs3/ ) which claims that it works on Windows & in Python 3.

Perhaps the sh docs might mention it briefly for people who need Windows functionality.

If only relatively simple functionality of sh is used, it should be possible for people to use sh on macOS/Linux but use pbs3 on Windows. Maybe someone would even care to make a package that wraps sh & pbs3 in a simple way, exposing the same API using the different backends depending on the platform.

[amoffat]

Is pbs3 still active? The last commit was quite awhile ago and the tests look incomplete. I could mention it if it was confirmed to be maintained and there was more information about feature parity. Could you follow up with xapple on this?

[amoffat]

Reopen if you decide to pursue this please.

[tritium21]

While it might not be prudent to change the recommendation from pbs to pbs3, it would be highly prudent to remove the recommendation to pbs - Yandex hijacked the pypi package.

[amoffat]

Good idea @tritium21. That's an easy fix