Move first line of bibtex to new line (#3)

- Move first line of bibtex to new line (b0684f39a53741f7690d597bc77dfcfc387750e8)


Co-authored-by: Dennis Rall <dennis-rall@users.noreply.huggingface.co>

README.md

@@ -76,7 +76,8 @@ 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},