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

@@ -34,37 +34,37 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: O
-          1: B-PERSON
-          2: I-PERSON
-          3: B-ORG
-          4: I-ORG
-          5: B-GPE
-          6: I-GPE
-          7: B-LOC
-          8: I-LOC
-          9: B-NAT_REL_POL
-          10: I-NAT_REL_POL
-          11: B-EVENT
-          12: I-EVENT
-          13: B-LANGUAGE
-          14: I-LANGUAGE
-          15: B-WORK_OF_ART
-          16: I-WORK_OF_ART
-          17: B-DATETIME
-          18: I-DATETIME
-          19: B-PERIOD
-          20: I-PERIOD
-          21: B-MONEY
-          22: I-MONEY
-          23: B-QUANTITY
-          24: I-QUANTITY
-          25: B-NUMERIC
-          26: I-NUMERIC
-          27: B-ORDINAL
-          28: I-ORDINAL
-          29: B-FACILITY
-          30: I-FACILITY
+          '0': O
+          '1': B-PERSON
+          '2': I-PERSON
+          '3': B-ORG
+          '4': I-ORG
+          '5': B-GPE
+          '6': I-GPE
+          '7': B-LOC
+          '8': I-LOC
+          '9': B-NAT_REL_POL
+          '10': I-NAT_REL_POL
+          '11': B-EVENT
+          '12': I-EVENT
+          '13': B-LANGUAGE
+          '14': I-LANGUAGE
+          '15': B-WORK_OF_ART
+          '16': I-WORK_OF_ART
+          '17': B-DATETIME
+          '18': I-DATETIME
+          '19': B-PERIOD
+          '20': I-PERIOD
+          '21': B-MONEY
+          '22': I-MONEY
+          '23': B-QUANTITY
+          '24': I-QUANTITY
+          '25': B-NUMERIC
+          '26': I-NUMERIC
+          '27': B-ORDINAL
+          '28': I-ORDINAL
+          '29': B-FACILITY
+          '30': I-FACILITY
   config_name: ronec
   splits:
   - name: train