Update README.md with Aria-chat release

Author: LiJunnan1992

README.md

@@ -14,6 +14,8 @@ Aria is a multimodal native MoE model. It features:
 
 
 ## News
+- [Dec 15, 2024] We release [Aria-Chat](https://huggingface.co/rhymes-ai/Aria-Chat)! It is optimized for open-ended and multi-round dialogs, with enhanced reliability and multi-lingual support.
+
 - [Dec 1, 2024] We release the base models for Aria ([Aria-Base-8K](https://huggingface.co/rhymes-ai/Aria-Base-8K) and [Aria-Base-64K](https://huggingface.co/rhymes-ai/Aria-Base-64K))! They are fully compatible with this inference \& fine-tuning codebase. 
 
 - [Oct 10, 2024] We release Aria!