Update release version to 0.8.0 (mlflow#699)

Fix issue with mlflow.start_run(run_uuid=<deleted_run>) (mlflow#579)

* init

* fix lint

Fix issue with mlflow.start_run(run_uuid=<deleted_run>) (mlflow#579)

* init

* fix lint

Update release version to 0.6.0 (mlflow#458)

Bump version and update changelog for 0.5.2 release (mlflow#369)

* Fix conflicts

* Add changelog

* Changelog fix

* Add name and author to changelog entry

Update release version to 0.5.1 (mlflow#356)

Update release version to 0.5.0 (mlflow#323)

Update release version to 0.4.2 (mlflow#262)

Add changelog & bump version for release 0.4.1 (mlflow#239)

* Add changelog for 0.4.1 release

Add changelog for 0.4.0 release (mlflow#228)

* Add changelog for 0.4.0 release