Update README.md

README.md

@@ -48,12 +48,12 @@ history = []
 query = '你是谁?'
 response = model.chat(query, history, tokenizer)
 print(response)
-history.append(query, response)
+history.append((query, response))
 
 query = '用Python写一个HTTP server'
 response = model.chat(query, history, tokenizer)
 print(response)
-history.append(query, response)
+history.append((query, response))
 ```
 
 开发者也可以通过VS Code与JetBrains插件与CodeShell-7B-Chat交互，详情请参[VSCode插件仓库](https://github.com/WisdomShell/codeshell-vscode)与[IntelliJ插件仓库](https://github.com/WisdomShell/codeshell-intellij)。