Update scikit-learn to 0.22.2

[pyup-bot]

This PR updates scikit-learn from 0.21.3 to 0.22.2.

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.

Links

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

[pyup-bot]

Closing this in favor of #121