minor change to bibtex formatting

README.md

@@ -51,7 +51,7 @@ The **robomimic** framework also makes reproducing the results from this [study]
 
 Please cite [this paper](https://arxiv.org/abs/2108.03298) if you use this framework in your work:
 
-```
+```bibtex
 @inproceedings{robomimic2021,
   title={What Matters in Learning from Offline Human Demonstrations for Robot Manipulation},
   author={Ajay Mandlekar and Danfei Xu and Josiah Wong and Soroush Nasiriany and Chen Wang and Rohun Kulkarni and Li Fei-Fei and Silvio Savarese and Yuke Zhu and Roberto Mart\'{i}n-Mart\'{i}n},