Update chatllm.py

fix bug: ChatCompletion

chatllm.py

@@ -81,7 +81,7 @@ class ChatLLM(LLM):
         
             # 配置OPENAI模型参数
             openai.api_key = os.getenv('openai_api_key')
-            response = openai.Completion.create(
+            response = openai.ChatCompletion.create(
                 model = 'gpt-3.5-turbo', 
                 messages = messages,
                 temperature = self.temperature,