Fix formatting in README

README.md

@@ -14,6 +14,9 @@ cd drug-combo-extraction
 tar -xvzf checkpoints_pubmedbert_cpt_2021_three_class.tgz
 
 python
-> from modeling.model import load_model
-> checkpoint_path = "checkpoints_pubmedbert_cpt_2021_three_class"
-> model, tokenizer, metadata = load_model(checkpoint_path)
+
+```
+from modeling.model import load_model
+checkpoint_path = "checkpoints_pubmedbert_cpt_2021_three_class"
+model, tokenizer, metadata = load_model(checkpoint_path)
+```