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

@@ -16,7 +16,6 @@ source_datasets:
 task_categories:
 - token-classification
 task_ids: []
-paperswithcode_id: null
 pretty_name: best2009
 tags:
 - word-tokenization
@@ -30,24 +29,24 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: b_e
-          1: c
-          2: d
-          3: n
-          4: o
-          5: p
-          6: q
-          7: s
-          8: s_e
-          9: t
-          10: v
-          11: w
+          '0': b_e
+          '1': c
+          '2': d
+          '3': n
+          '4': o
+          '5': p
+          '6': q
+          '7': s
+          '8': s_e
+          '9': t
+          '10': v
+          '11': w
   - name: is_beginning
     sequence:
       class_label:
         names:
-          0: neg
-          1: pos
+          '0': neg
+          '1': pos
   config_name: best2009
   splits:
   - name: train