Merge remote-tracking branch 'upstream/master' into isotonic-increasing-auto
Merge branch 'master' of https://github.com/scikit-learn/scikit-learn
Adding tests to handle out_of_bounds parameter.
Adding out_of_bounds parameter to handle values outside training domain
Adding test for out_of_bounds argument validation
Reworking .transform conditionals for out_of_bounds argument
PEP8 fix
Merge pull request #3199 from mjbommar/isotonic-out-of-bounds-2

Handling out-of-bounds in IsotonicRegression (clean PR #3147)