Fix language and license tag names

README.md

@@ -1,13 +1,12 @@
 ---
-pretty_name: C4
 annotations_creators:
 - no-annotation
 language_creators:
 - found
-languages:
+language:
 - en
-licenses:
-- odc-by-1-0
+license:
+- odc-by
 multilinguality:
 - multilingual
 size_categories:
@@ -21,6 +20,7 @@ task_ids:
 - language-modeling
 - masked-language-modeling
 paperswithcode_id: c4
+pretty_name: C4
 ---
 
 # Dataset Card for C4