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:
 - cc-by-nc-sa-3.0
 multilinguality:
 - monolingual
-pretty_name: Answer Sentence Natural Questions (ASNQ)
 size_categories:
 - 10M<n<100M
 source_datasets:
@@ -19,6 +18,7 @@ task_categories:
 task_ids:
 - multiple-choice-qa
 paperswithcode_id: asnq
+pretty_name: Answer Sentence Natural Questions (ASNQ)
 dataset_info:
   features:
   - name: question
@@ -29,8 +29,8 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: neg
-          1: pos
+          '0': neg
+          '1': pos
   - name: sentence_in_long_answer
     dtype: bool
   - name: short_answer_in_sentence