update changelog

Author: tylanderson

CHANGELOG.md

@@ -8,6 +8,10 @@
   media type value for these types and new media types COPC and VND_PMTILES
   ([#1554](https://github.com/stac-utils/pystac/pull/1554))
 
+### Changed
+
+- Updated storage extension to v2.0.0
+
 ### Fixed
 
 - More permissive collection extent deserialization ([#1559](https://github.com/stac-utils/pystac/pull/1559))