Update citation format in README.md

Author: govindchari

README.md

@@ -38,14 +38,16 @@ File any issues or bug reports using the [issue tracker](https://github.com/qoco
 
 ## Citing
 ```
-@misc{chari2025qoco,
-  title         = {QOCO: A Quadratic Objective Conic Optimizer with Custom Solver Generation},
-  author        = {Chari, Govind M and A{\c{c}}{\i}kme{\c{s}}e, Beh{\c{c}}et},
-  year          = {2025},
-  eprint        = {2503.12658},
-  archiveprefix = {arXiv},
-  primaryclass  = {math.OC},
-  url           = {https://arxiv.org/abs/2503.12658}
+@article{chari2026qoco,
+  title = {QOCO: a quadratic objective conic optimizer with custom solver generation},
+  author = {Chari, Govind M. and A\c{c}ıkmeşe, Beh\c{c}et},
+  journal = {Mathematical Programming Computation},
+  issn = {1867-2957},
+  url = {http://dx.doi.org/10.1007/s12532-026-00311-8},
+  doi = {10.1007/s12532-026-00311-8},
+  publisher = {Springer Science and Business Media LLC},
+  year = {2026},
+  month = mar,
 }
 ```