Python 3.7.0 support

Created by: ololobus

DeepPavlov has scikit-learn version fixed to v0.19.1, but its c-extensions build fails on python 3.7.0 (at least on macOS), please see scikit-learn issue.

This issue has been fixed in scikit-learn v0.19.2 release, so you have to up at least minor version to enable python 3.7.0 support.

I can try python 3.7.0 compatibility of other packages and prepare a pull-request, if you want.