Bump version to 2.0.0 (cleanlab#222)

* bump version

* Add brief release notes. see release for extensive

Co-authored-by: Curtis G. Northcutt <[email protected]>

Merge pull request cleanlab#125 from cgnorthcutt/release101

Update version to 1.0.1

cleanlab version 1.0 beta launch!

Merge branch 'master' of github.com:cgnorthcutt/cleanlab