change from Sequence to list

mfaq.py

@@ -73,13 +73,13 @@ class MFAQ(datasets.GeneratorBasedBuilder):
                     "language": datasets.Value("string"),
                     "num_pairs": datasets.Value("int64"),
                     "domain": datasets.Value("string"),
-                    "qa_pairs": datasets.features.Sequence(
+                    "qa_pairs": [
                         {
                             "question": datasets.Value("string"), 
                             "answer": datasets.Value("string"),
                             "language": datasets.Value("string")
                         }
-                    )
+                    ]
                 }
             )
         return datasets.DatasetInfo(