0.2.0 - 9 December 2021

- Added `Catalog::images_for_collection()` to get the list of images
  belonging to a collection.
- Allow immutable access to Catalog object once loaded:
  - `Catalog::images()`
  - `Catalog::keywords()`
  - `Catalog::folders()`
  - `Catalog::libfiles()`
  - `Catalog::collections()`
- Possible support for Lr3 catalogs (largely untested).
- Performance improvements.

0.1.0 - 12 November 2021

- Initial release