Updates CHANGELOG

Author: eamodio

CHANGELOG.md

@@ -9,7 +9,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 ### Added
 
 - Adds and expands AI model support for GitLens' AI features
-  - Adds DeepSeek V3 and R1 models
+  - Adds DeepSeek V3 and R1 models — closes [#3943](https://github.com/gitkraken/vscode-gitlens/issues/3943)
   - Adds the latest experimental Gemini 2.0 Flash Thinking model
   - Adds a `gitlens.ai.modelOptions.temperature` setting to specify the temperature (randomness) for AI models
   - Adds a _Switch Model_ button to the AI confirmation prompts