Update citation in README

README.md

@@ -192,12 +192,11 @@ This model is intended to be finetuned on downstream tasks.
 Please cite this model using the following format:
 
 ```
-@online{Portes2023MosaicBERT,
-    author    = {Jacob Portes and Alex Trott and Daniel King and Sam Havens},
-    title     = {MosaicBERT: Pretraining BERT from Scratch for \$20},
-    year      = {2023},
-    url       = {https://www.mosaicml.com/blog/mosaicbert},
-    note      = {Accessed: 2023-03-28}, % change this date
-    urldate   = {2023-03-28} % change this date
+@article{portes2023MosaicBERT,
+  title={MosaicBERT: A Bidirectional Encoder Optimized for Fast Pretraining},
+  author={Jacob Portes, Alexander R Trott, Sam Havens, Daniel King, Abhinav Venigalla,
+  Moin Nadeem, Nikhil Sardana, Daya Khudia, Jonathan Frankle},
+  journal={NeuRIPS https://openreview.net/pdf?id=5zipcfLC2Z},
+  year={2023},
 }
 ```