Replace YAML keys from int to str

Replace YAML metadata integer keys with strings, as the Hub does not support integers.
See: https://github.com/huggingface/datasets/issues/5275

README.md

@@ -18,7 +18,6 @@ task_categories:
 - text2text-generation
 task_ids:
 - text-simplification
-paperswithcode_id: null
 pretty_name: WikiAuto
 configs:
 - auto
@@ -33,9 +32,9 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: notAligned
-          1: aligned
-          2: partialAligned
+          '0': notAligned
+          '1': aligned
+          '2': partialAligned
   - name: normal_sentence_id
     dtype: string
   - name: simple_sentence_id