Update README.md

README.md

@@ -56,6 +56,7 @@ Cite:
   year = {2023},
   publisher = {Hynek Kydlíček},
   doi       = { 10.57967/hf/1608 },
+  url = {https://matematickyklokan.net/}
   howpublished = "\url{https://huggingface.co/datasets/hynky/klokan-qa}"
 }
 ```