Update model card

README.md

@@ -8,6 +8,7 @@ datasets:
 ## ProcBERT
 ProcBERT is a pre-trained language model specifically for procedural text. It was pre-trained on a large-scale procedural corpus (PubMed articles/chemical patents/recipes) containing over 12B tokens and shows great performance on downstream tasks. More details can be found in the following paper:
 
+```
 @article{Bai2021PretrainOA,
   title={Pre-train or Annotate? Domain Adaptation with a Constrained Budget},
   author={Fan Bai and Alan Ritter and Wei Xu},
@@ -15,6 +16,7 @@ ProcBERT is a pre-trained language model specifically for procedural text. It wa
   year={2021},
   volume={abs/2109.04711}
 }
+```
 
 ## Usage
 ```