Move first line of bibtex to new line

README.md

@@ -72,7 +72,8 @@ For evaluation results on several image classification benchmarks, we refer to t
 
 ### BibTeX entry and citation info
 
-```@article{DBLP:journals/corr/abs-2106-08254,
+```bibtex
+@article{DBLP:journals/corr/abs-2106-08254,
   author    = {Hangbo Bao and
                Li Dong and
                Furu Wei},