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

@@ -1,15 +1,14 @@
 ---
 annotations_creators:
 - crowdsourced
-language:
-- en
 language_creators:
 - found
+language:
+- en
 license:
 - other
 multilinguality:
 - monolingual
-pretty_name: WikiQA
 size_categories:
 - 10K<n<100K
 source_datasets:
@@ -19,6 +18,7 @@ task_categories:
 task_ids:
 - open-domain-qa
 paperswithcode_id: wikiqa
+pretty_name: WikiQA
 dataset_info:
   features:
   - name: question_id
@@ -33,8 +33,8 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: '0'
-          1: '1'
+          '0': '0'
+          '1': '1'
   splits:
   - name: test
     num_bytes: 1337903