Update chain_app.py

chain_app.py

@@ -168,7 +168,8 @@ async def on_chat_start():
                 step=64,
                 tooltip="Measured in pixels",
             ),
-            ]).send()
+            ]
+            ).send()
 
         image = cl.Image(path='cat.png', name="result", display="inline")
         await cl.Message(