docs: update CHANGELOG for v0.9.0

CHANGELOG.md

@@ -7,9 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Nothing yet
+
+## [0.9.0] - 2023-05-17
+
 ### Added
 
-- New Clone and SetParent methods
+- Parents of AdaptationSets, Representations, and SubRepresentations
+- Methods AppendAdaptationSet to Period, and so on
+- New Clone methods
 
 ## [0.8.0] - 2023-04-10
 
@@ -73,7 +79,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Tests with well-known MPDs
 - Tweaked XML library to support namespaces
 
-[Unreleased]: https://github.com/Eyevinn/dash-mpd/compare/v0.8.0...HEAD
+[Unreleased]: https://github.com/Eyevinn/dash-mpd/compare/v0.9.0...HEAD
+[0.9.0]: https://github.com/Eyevinn/dash-mpd/compare/v0.8.0...v0.9.0
 [0.8.0]: https://github.com/Eyevinn/dash-mpd/compare/v0.7.0...v0.8.0
 [0.7.0]: https://github.com/Eyevinn/dash-mpd/compare/v0.6.1...v0.7.0
 [0.6.1]: https://github.com/Eyevinn/dash-mpd/compare/v0.6.0...v0.6.1