Fix language and license tag names (#2)

- Fix language and license tag names (cb63d7de047326dc2b92b221c4cf87a34d4b8335)

README.md

@@ -4,11 +4,11 @@ annotations_creators:
 - expert-generated
 language_creators:
 - expert-generated
-languages:
-- en-US
+language:
 - en
-licenses:
-- mitmultilinguality:
+license:
+- mit
+multilinguality:
 - monolingual
 pretty_name: 'NewsMTSC'
 size_categories:
@@ -19,6 +19,8 @@ task_categories:
 - text-classification
 task_ids:
 - sentiment-classification
+language_bcp47:
+- en-US
 ---
 # NewsMTSC dataset