Update scikit-learn to 0.22.1

[pyup-bot]

This PR updates scikit-learn from 0.20.0 to 0.22.1.

Changelog

0.22.1

We're happy to announce the 0.22.1 bugfix release. 
Change log under https://scikit-learn.org/stable/whats_new/v0.22.htmlchanges-0-22-1.

This version supports Python versions 3.5 to 3.8.

0.22

We're happy to announce the 0.22 release. You can read
the release highlights under https://scikit-learn.org/stable/auto_examples/release_highlights/plot_release_highlights_0_22_0.html
and the long version of the change log under https://scikit-learn.org/stable/whats_new/v0.22.htmlchanges-0-22.

This version supports Python versions 3.5 to 3.8.

0.21.3

A bug fix and documentation release, fixing regressions and other issues released in version 0.21. See change log at https://scikit-learn.org/0.21/whats_new/v0.21.html

0.21.2

This version fixes a few bugs released in 0.21.1.

0.21.1

See changes at https://scikit-learn.org/0.21/whats_new/v0.21.html

Fixes some packaging issues in version 0.21.0 along with a few bugs.

0.21.0

A new release of Scikit-learn with many new features, enhancements and bug fixes. See https://scikit-learn.org/0.21/whats_new/v0.21.html

0.20.4

Builds on top of Scikit-learn 0.20.3 to fix regressions and other issues released in version 0.20. See change log at https://scikit-learn.org/0.20/whats_new/v0.20.html

0.20.3

A bug-fix release in the 0.20 series, supporting Python 2 and 3

0.20.2

Bug-fix release to the 0.20 branch, supporting Python 2 and 3

0.20.1

Released 21 November 2018.

See changelog at https://scikit-learn.org/0.20/whats_new.htmlversion-0-20-1

Links

• PyPI: https://pypi.org/project/scikit-learn
• Changelog: https://pyup.io/changelogs/scikit-learn/
• Homepage: http://scikit-learn.org