Change max steps

app.py

@@ -42,7 +42,7 @@ def replay(env_name, max_steps, time_sleep):
   done = False
   i = 0
   while not done:
-      i++
+      i+= 1
       if i < max_steps:
           frame = env.render(mode="rgb_array")
           action, _states = model.predict(obs)