Quote class label ids in YAML

We fixed a bug recently where datasets wouldn't use quote for class label ids. Now it does, in order to let the Hugging face Hub parse the YAML correctly.

README.md

@@ -11,11 +11,11 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: O
-          1: LOC
-          2: PER
-          3: MISC
-          4: ORG
+          '0': O
+          '1': LOC
+          '2': PER
+          '3': MISC
+          '4': ORG
   splits:
   - name: test
     num_bytes: 5954708