update qr code

Author: echo-yiyiyi

README.md

@@ -233,7 +233,7 @@ The source code is licensed under Apache 2.0.
 [huggingface-image]: https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-CAMEL--AI-ffc107?color=ffc107&logoColor=white
 [huggingface-url]: https://huggingface.co/camel-ai
 [oasis-image]: https://img.shields.io/badge/WeChat-OASISProject-brightgreen?logo=wechat&logoColor=white
-[oasis-url]: ./assets/oasis_wechat.jpg
+[oasis-url]: ./assets/wechatgroup.png
 [package-license-image]: https://img.shields.io/badge/License-Apache_2.0-blue.svg
 [package-license-url]: https://github.com/camel-ai/oasis/blob/main/licenses/LICENSE
 [reddit-image]: https://img.shields.io/reddit/subreddit-subscribers/CamelAI?style=plastic&logo=reddit&label=r%2FCAMEL&labelColor=white