Fix language and license tag names and tags (#2)

- Fix language and license tag names and tags (89ddce7c9e3201bd5d8af0a0d34580e6777affb3)

README.md

@@ -3,11 +3,12 @@ annotations_creators:
 - expert-generated
 language_creators:
 - crowdsourced
-languages:
-- en-US
+language:
 - en
-licenses:
-- other-free-for-noncommercial-uses
+language_bcp47:
+- en-US
+license:
+- other
 multilinguality:
 - monolingual
 pretty_name: Buckeye Corpus