DOC update version to 0.20.2

don't set check_pickle on new joblib on python2.7 (scikit-learn#12645)

ColumnTransformer generalization to work on empty lists (scikit-learn…

…#12084)

MNT rc version

Release 0.19.2

TST Improve SelectFromModel tests (scikit-learn#9733)

Should fix one of the issues in scikit-learn#9393

Release 0.19.0

Release 0.19b2

0.19b1 release tag

DOC typos in whats_news.rst [ci skip]