Fix language and license tag names

README.md

@@ -1,14 +1,13 @@
 ---
-pretty_name: SQuAD
 annotations_creators:
 - crowdsourced
 language_creators:
 - crowdsourced
 - found
-languages:
+language:
 - en
-licenses:
-- cc-by-4-0
+license:
+- cc-by-4.0
 multilinguality:
 - monolingual
 size_categories:
@@ -20,6 +19,7 @@ task_categories:
 task_ids:
 - extractive-qa
 paperswithcode_id: squad
+pretty_name: SQuAD
 ---
 
 # Dataset Card for "squad"