Update README.md

README.md

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 This repo contains a large ocean generative model (OceanGPT) built with ocean science dataset. It should be noted that the OceanGPT is constantly being updated, so the current model is not the final version.
 
 ## 🔍 Intended uses
-You can download the model to generate responses or use the [**online demo**](http://knowlm.zjukg.cn/oceangpt).
+You can download the model to generate responses or contact the [email](bizhen_zju@zju.edu.cn) for the online test demo.
 
 ## 🛠️ How to use by yourself
 We wil provide several examples soon and you can modify the input according to your needs.