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

@@ -1286,24 +1286,24 @@ dataset_info:
       dtype:
         class_label:
           names:
-            0: AFFIRM
-            1: AFFIRM_INTENT
-            2: CONFIRM
-            3: GOODBYE
-            4: INFORM
-            5: INFORM_COUNT
-            6: INFORM_INTENT
-            7: NEGATE
-            8: NEGATE_INTENT
-            9: NOTIFY_FAILURE
-            10: NOTIFY_SUCCESS
-            11: OFFER
-            12: OFFER_INTENT
-            13: REQUEST
-            14: REQUEST_ALTS
-            15: REQ_MORE
-            16: SELECT
-            17: THANK_YOU
+            '0': AFFIRM
+            '1': AFFIRM_INTENT
+            '2': CONFIRM
+            '3': GOODBYE
+            '4': INFORM
+            '5': INFORM_COUNT
+            '6': INFORM_INTENT
+            '7': NEGATE
+            '8': NEGATE_INTENT
+            '9': NOTIFY_FAILURE
+            '10': NOTIFY_SUCCESS
+            '11': OFFER
+            '12': OFFER_INTENT
+            '13': REQUEST
+            '14': REQUEST_ALTS
+            '15': REQ_MORE
+            '16': SELECT
+            '17': THANK_YOU
     - name: slot
       dtype: string
     - name: values