Update citation format

README.md

@@ -100,10 +100,10 @@ unaided in 34 seconds.
 ## Citation
 
 ```bibtex
-@article{zhang2026activevision,
-  title   = {An Exam for Active Observers},
-  author  = {Zhang, Jiarui and Tao, Muzi and Wang, Shangshang and Liu, Ollie and Ma, Xuezhe and Neiswanger, Willie},
-  journal = {arXiv preprint arXiv:2607.16165},
-  year    = {2026}
+@article{zhang2026exam,
+  title={An exam for active observers},
+  author={Zhang, Jiarui and Tao, Muzi and Wang, Shangshang and Liu, Ollie and Ma, Xuezhe and Neiswanger, Willie},
+  journal={arXiv preprint arXiv:2607.16165},
+  year={2026}
 }
 ```