Update app.py

app.py

@@ -571,6 +571,7 @@ def process_input(user_input, process):
     if process:
         try:
             if user_input=='Ctrl+C':
+                print('process stoping')
                 process.send_signal(signal.SIGINT)
             else:
                 process.stdin.write(user_input.encode('utf-8') + b'\n')