Update bibtex with publication venue.

README.md

@@ -1342,10 +1342,10 @@ differ between providers.
 ## Citation
 
 ```bibtex
-@article{waxal2026,
+@article{diack2026waxal,
   title={WAXAL: A Large-Scale Multilingual African Language Speech Corpus},
-  author={Anonymous},
-  journal={arXiv preprint arXiv:2602.02734},
+  author={Diack, Abdoulaye and Nelson, Perry and MohamedKhair, MohamedElfatih and Brempong, Emmanual Asiedu and Venugopalan, Subhashini and Okonkwo, Uche and others},
+  journal={NeurIPS 2026},
   year={2026}
 }
 ```