Update custom_llm.py

Some subtle changes from lagacy to new API

custom_llm.py

@@ -18,7 +18,7 @@ class CustomLLM(LLM):
             raise ValueError("stop kwargs are not permitted.")
 
         response = co.chat(message=f'{prompt}', max_tokens=1700, temperature=0.9)
-        print(response.generations[0].text)
+        print(response.text)
 
         return f' ```python \n {response.generations[0].text} \n ``` '