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

@@ -38,8 +38,8 @@ dataset_info:
       dtype:
         class_label:
           names:
-            0: USER
-            1: SYSTEM
+            '0': USER
+            '1': SYSTEM
     - name: utterance
       dtype: string
     - name: frames
@@ -72,24 +72,24 @@ 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: canonical_values