update max queue size to 20.

app.py

@@ -290,5 +290,5 @@ demo = gr.Interface(
         ['05.jpg', True, True, 2, 0.1]
       ])
 
-demo.queue(api_open=False, concurrency_count=2, max_size=10)
+demo.queue(api_open=False, concurrency_count=2, max_size=20)
 demo.launch()