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

@@ -9,8 +9,6 @@ license:
 - cc-by-4.0
 multilinguality:
 - monolingual
-paperswithcode_id: wnut-2017-emerging-and-rare-entity
-pretty_name: WNUT 17
 size_categories:
 - 1K<n<10K
 source_datasets:
@@ -19,6 +17,8 @@ task_categories:
 - token-classification
 task_ids:
 - named-entity-recognition
+paperswithcode_id: wnut-2017-emerging-and-rare-entity
+pretty_name: WNUT 17
 dataset_info:
   features:
   - name: id
@@ -29,19 +29,19 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: O
-          1: B-corporation
-          2: I-corporation
-          3: B-creative-work
-          4: I-creative-work
-          5: B-group
-          6: I-group
-          7: B-location
-          8: I-location
-          9: B-person
-          10: I-person
-          11: B-product
-          12: I-product
+          '0': O
+          '1': B-corporation
+          '2': I-corporation
+          '3': B-creative-work
+          '4': I-creative-work
+          '5': B-group
+          '6': I-group
+          '7': B-location
+          '8': I-location
+          '9': B-person
+          '10': I-person
+          '11': B-product
+          '12': I-product
   config_name: wnut_17
   splits:
   - name: train