Update README.md

Fix typo in bibtex (switch from & -> \&) which previously caused compilation errors when used in Latex.

README.md

@@ -171,7 +171,7 @@ This larger model `gpt-oss-120b` can be fine-tuned on a single H100 node, wherea
 
 ```bibtex
 @misc{openai2025gptoss120bgptoss20bmodel,
-      title={gpt-oss-120b & gpt-oss-20b Model Card}, 
+      title={gpt-oss-120b \& gpt-oss-20b Model Card}, 
       author={OpenAI},
       year={2025},
       eprint={2508.10925},