v0.2.0 - `BoundedRegion` and IO with `to_grs` and `open_grs`

Full Changelog: v0.1.1...v0.2.0

v0.1.1

Bump minor version number

v0.0.2: install with minimal dependencies

Merge pull request #7 from hdrake/switch-to-pyproject-toml

Attempt to add minimal dependency packages

Initial release: xgcm grid-consistent masks and boundaries

Merge pull request #6 from hdrake/switch-to-pyproject-toml

Switch from setup.py to pyproject.toml