chore: update changelog draft

Author: bang9

CHANGELOG_DRAFT.md

@@ -1,23 +1,5 @@
-## v3.1.0
-
-### Features
-
-- Added Quote reply feature in group channels (default: turned on)
-  ```tsx
-  const App = () => {
-    <SendbirdUIKitContainer
-      appId={APP_ID}
-      uikitOptions={{
-        groupChannel: {
-          replyType: 'none', // 'none', 'quote_reply'
-        },
-      }}
-    />;
-  };
-  ```
+## v3.1.1
 
 ### Improvements
 
-- Updated the minimum chat SDK version to v4.9.8.
-- Improved video thumbnail fetching and caching logic in the native media service.
-- Enhanced stability.
+- When there is a thumbnail in the message, uses the first thumbnail of the video/image message