Update CI in README.md

[rohitgr7]

What does this PR do?

Fixes #12483
Closes #12490
Also a small changelog and minor doc update.

Does your PR introduce any breaking changes? If yes, please list them.

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cc @Borda @rohitgr7 @carmocca @akihironitta

[awaelchli]

Amazing that we still find typos on the README after 2+ years.

[akihironitta]

Thank you for updating this!

[akihironitta]

Also, to be precise, I think we have conda tests with (py3.9, torch1.11) but not with (py3.8, torch1.11).

[akihironitta]

LGTM! Thank you, Rohit!