Python formatting

save my eyes by formatting the code :)

README.md

@@ -34,7 +34,7 @@ All models are train on these dataset with a same split seed across datasets (if
 
 # How to use
 
-```
+```python
 from transformers import AutoModelForSequenceClassification, AutoTokenizer
 reward_name = "OpenAssistant/reward-model-deberta-v3-large"
 rank_model, tokenizer = AutoModelForSequenceClassification.from_pretrained(reward_name), AutoTokenizer.from_pretrained(reward_name)