Update README.md

README.md

@@ -23,7 +23,7 @@ If you apply this library or model to any project and research, please cite our
   author        = {Sojung Lucia Kim (Lucia), Tea Hong Jang (Ted), Joon Mo Ahn (Joon), Hyng Il Lee (Henry)},
   year          = {2023},
   howpublished  = {\url{https://huggingface.co/Nara-Lab/History_NER}},
-  url = {https://arxiv.org/abs/2306.14592a},
+  url = {https://arxiv.org/abs/2306.14592},
 }
 
 ```