Update CHANGELOG

Author: duckontheweb

CHANGELOG.md

@@ -16,6 +16,8 @@
 - Package author to `stac-utils`, email to `stac@radiant.earth`, url to this repo ([#409](https://github.com/stac-utils/pystac/pull/409))
 - `StacIO.read_json` passes arbitrary positional and keyword arguments to
   `StacIO.read_text` ([#433](https://github.com/stac-utils/pystac/pull/433))
+- `FileExtension` updated to work with File Info Extension v2.0.0 ([#442](https://github.com/stac-utils/pystac/pull/442))
+- `FileExtension` only operates on `pystac.Asset` instances ([#442](https://github.com/stac-utils/pystac/pull/442))
 
 ### Fixed