chore: update changelog

Author: gadomski

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Include kwargs in io `read_text` for use with internal `fsspec.open` call. ([#372](https://github.com/stac-utils/stactools/pull/372))
 - Python 3.11 support ([#376](https://github.com/stac-utils/stactools/pull/376))
+- `stac summary` command ([#323](https://github.com/stac-utils/stactools/pull/323))
 
 ### Changed