Fixing small bug (version dependant)

app.py

@@ -189,7 +189,7 @@ def chat(message, history):
     """
     Chat function for Gradio. Uses the pipeline to produce next answer.
     """
-    conv_history = "\n\n".join([f"{message["role"]}: {message["content"]}" for message in history[-2:]])
+    conv_history = "\n\n".join([f'{message["role"]}: {message["content"]}' for message in history[-2:]])
     user_history = [message for message in history if message["role"] == "user"]
     results = answer_query.run({"user_history": user_history,
                                 "query": message,