What's Changed
* introduce repo concept, make plumbing CLI available as dvc-data command by skshetry in https://github.com/iterative/dvc-data/pull/82
* cli: update-tree: mutating command line args, rich exception handling, etc. by skshetry in https://github.com/iterative/dvc-data/pull/94
* cli: add show/du/rm/count-objects by skshetry in https://github.com/iterative/dvc-data/pull/95
* deps: bump dvc-objects to 0.0.21
**Full Changelog**: https://github.com/iterative/dvc-data/compare/0.0.20...0.0.21