Bump version to 0.6.2 (modin-project#834)

Bump version to 0.6.1 (modin-project#805)

Version bump/0.6.0 (modin-project#776)

* Bump version to 0.6.0

* Fix readme badge

Release 0.5.4 (modin-project#740)

Bump to 0.5.3 (modin-project#695)

Bump to 0.5.2 (modin-project#645)

Bump version to 0.5.1 (modin-project#640)

Bump version to 0.5.0 (modin-project#585)

Bump Version 0.4.0 (modin-project#495)

Bump version to 0.4.0rc1 (modin-project#483)