Update README.md

README.md

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-# Decision Transformer model trained on expert trajectories sampled from the Gym Hopper environment
+# Decision Transformer model trained on expert trajectories sampled from the Gym Half Cheetah environment
 This is a trained [Decision Transformer](https://arxiv.org/abs/2106.01345) model trained from scratch on expert trajectories sampled from the Gym Half Cheetah environment based on the example [training script](https://github.com/huggingface/blog/blob/main/notebooks/101_train-decision-transformers.ipynb) tutorial provided by HuggingFace
 
 ## Training procedure