Change markdown to bibtex

Author: lucas-ventura

README.md

@@ -212,7 +212,7 @@ There are many pre-defined experiments from the paper in ``configs/experiments``
 ## Citation
 If you use this dataset and/or this code in your work, please cite our [paper](https://arxiv.org/abs/2308.14746):
 
-```markdown
+```bibtex
 @article{ventura23covr,
     title     = {{CoVR}: Learning Composed Video Retrieval from Web Video Captions},
     author    = {Lucas Ventura and Antoine Yang and Cordelia Schmid and G{\"u}l Varol},