docs: Update CHANGELOG.md for v0.9.1

Author: taj54

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes for each version of the Ambient Music extension.
 
 ---
 
+## v0.9.1 2025 08 25
+
+### Changed
+
+- Bumped version to v0.9.1.
+
 ## v0.9.0 2025 08 25
 
 ### Added
@@ -310,4 +316,4 @@ All notable changes for each version of the Ambient Music extension.
 - CI: Keep the versions up-to-date.
 - Updated.
 - Build: Update build script.
-- Updated readme.
+- Updated readme.