[scikit-learn] [ANN] Scikit-learn 0.20.0

[Andreas Mueller]

Hey everbody!
I'm happy to (finally) announce scikit-learn 0.20.0.
This release is dedicated to the memory of Raghav Rajagopalan.

You can upgrade now with pip or conda!

There is many important additions and updates, and you can find the full
release notes here:
http://scikit-learn.org/stable/whats_new.html#version-0-20

My personal highlights are the ColumnTransformer and the changes to 
OneHotEncoder,
but there's so much more!

An important note is that this is the last version to support Python2.7, 
and the
next release will require Python 3.5.

A big thank you to everybody who contributed and special thanks to Joel!

All the best,
Andy