Update README.md (#336)

Stable-Baselines-Team · May 23, 2019 · 4bb82b5 · 4bb82b5
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diff --git a/README.md b/README.md
@@ -115,6 +115,8 @@ for i in range(1000):
     action, _states = model.predict(obs)
     obs, rewards, dones, info = env.step(action)
     env.render()
+
+env.close()
 ```
 
 Or just train a model with a one liner if [the environment is registered in Gym](https://github.com/openai/gym/wiki/Environments) and if [the policy is registered](https://stable-baselines.readthedocs.io/en/master/guide/custom_policy.html):