setup.py fix sklearn → scikit-learn

[maresb]

The package name is scikit-learn while the import is sklearn.

See https://pypi.org/project/sklearn/ for the official recommendation.

Requiring sklearn can lead to subtle problems as explained in https://github.com/scikit-learn/scikit-learn/issues/8215 .

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[maresb]

@googlebot I signed it!

[mmilanifard]

Thanks for the fix. Unfortunately we do not accept pull requests as our code release process cannot accommodate them at the moment. We will apply the fix and link to this pull request in the notes.

[maresb]

No problem, thanks @mmilanifard!

[maresb]

I see that this has been fixed in v2.0.9. Thank you!