chore: update CHANGELOG.md

Author: isc-tleavitt

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added warnings when user is using incompatible git version (#488)
 - Fixed the back button navigation between WebUI and Settings page (#361)
 - Basic mode Sync operation now imports items changed on the remote merge branch (#506)
+- Fetch diff output uses correct remote branch (#509)
 
 ## [2.5.0] - 2024-09-24