Update poquad.py

poquad.py

@@ -118,6 +118,7 @@ class SquadV2(datasets.GeneratorBasedBuilder):
                         # Others are extracted here for the ease of future expansions.
                         id_ += 1
                         yield str(id_), {
+                            "id": str(id_),
                             "title": title,
                             "context": context,
                             "question": question,