v0.13.2 (alteryx#848)

* bump version number

* update changelog

bump version number

v0.13.1 (alteryx#839)

* update version number

* bump version

* add release header to changelog

* remove unused changelog sections

* update changelog entry about sklearn

update version number

v0.13.0 (alteryx#830)

* add breaking change note about Diff

* bump version number

* alphabetize contributor list

* add release heading to changelog

bump version number

v0.12.0 (alteryx#794)

* bump version number

* update changelog

v0.11.0 (alteryx#757)

* bump version number

* alphabetize contributors

* version number in changelog

* fix tab spacing

* add warning about dropping python 2

v0.10.1 (alteryx#713)

* bump version number

* bump version number

* update changelog