Update app.py

app.py

@@ -35,7 +35,7 @@ def respond(message, history):
     response = decoded[len(prompt):].strip().split("\n")[0]
 
     # append to history as a tuple of two plain strings
-    history.append((message, response))
+    history.append([message, response])
     # return "" to clear the textbox, and the updated history for the Chatbot
     return "", history