Update README.md

README.md

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       library_name: ml-agents
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-  # **ppo** Agent playing **Huggy**
-  This is a trained model of a **ppo** agent playing **Huggy** using the [Unity ML-Agents Library](https://github.com/Unity-Technologies/ml-agents).
+  # **PPO** Agent playing **Huggy**
+  This is a trained model of a **PPO** agent playing **Huggy** using the [Unity ML-Agents Library](https://github.com/Unity-Technologies/ml-agents).
   
   ## Usage (with ML-Agents)
   The Documentation: https://github.com/huggingface/ml-agents#get-started