update changelog

Author: rgbkrk

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.1.1]
+
+### Fixed
+- Fixed a bug where the final render of a tool call was not being displayed in the UI.
+
 ## [2.1.0]
 
 ### Added