Update README.md

README.md

@@ -100,7 +100,7 @@ This dataset (RefSeq Release 235) was retrieved and optimally processed by [hugg
   title        = {NCBI RefSeq Complete (Release 234) March 20, 2026 - Processed for ML Research},
   year         = {2026},
   publisher    = {Hugging Face},
-  url = https://ftp.ncbi.nlm.nih.gov/refseq/release/
+  url          = {https://ftp.ncbi.nlm.nih.gov/refseq/release}
   howpublished = {\url{https://huggingface.co/datasets/huggingworld/ncbi-refseq-complete}}
 }
 ```