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

@@ -28,13 +28,13 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: O
-          1: B-PER
-          2: I-PER
-          3: B-ORG
-          4: I-ORG
-          5: B-LOC
-          6: I-LOC
+          '0': O
+          '1': B-PER
+          '2': I-PER
+          '3': B-ORG
+          '4': I-ORG
+          '5': B-LOC
+          '6': I-LOC
   splits:
   - name: test
     num_bytes: 935298