Update poquad.py

poquad.py

@@ -23,7 +23,7 @@ PoQuaD description
 
 _URLS = {
     "train": "https://huggingface.co/datasets/clarin-pl/poquad/blob/main/poquad-dev.json",
-    "dev": "https://huggingface.co/datasets/clarin-pl/poquad/blob/main/poquad-train.json,
+    "dev": "https://huggingface.co/datasets/clarin-pl/poquad/blob/main/poquad-train.json",
 }