update chagenlog

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning 2.0](https://semver.org/spec/v2.0.0.html).
 
 ## v2.9.1
+### Added
+- Fixed [#498](https://github.com/LykosAI/StabilityMatrix/issues/498) - Added "Pony" category to CivitAI Model Browser
 ### Fixed
 - Fixed [#502](https://github.com/LykosAI/StabilityMatrix/issues/502) - missing launch options for Forge
 - Fixed [#500](https://github.com/LykosAI/StabilityMatrix/issues/500) - missing output images in Forge when using output sharing