Bump version to 0.2.2

version 0.2.2 - latest fixes with sklearn 0.22 (#35)

* Fix sk22 followup (#44)

* fix clustering CV

* add conditional test

* spaces

* compat sk21 and sk22

* compat sk21 and sk22

* clean up

* bump version to 0.2.2

* bump version to 0.2.1

* bump version to 0.2.2-dev