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

@@ -117,34 +117,34 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: admiration
-          1: amusement
-          2: anger
-          3: annoyance
-          4: approval
-          5: caring
-          6: confusion
-          7: curiosity
-          8: desire
-          9: disappointment
-          10: disapproval
-          11: disgust
-          12: embarrassment
-          13: excitement
-          14: fear
-          15: gratitude
-          16: grief
-          17: joy
-          18: love
-          19: nervousness
-          20: optimism
-          21: pride
-          22: realization
-          23: relief
-          24: remorse
-          25: sadness
-          26: surprise
-          27: neutral
+          '0': admiration
+          '1': amusement
+          '2': anger
+          '3': annoyance
+          '4': approval
+          '5': caring
+          '6': confusion
+          '7': curiosity
+          '8': desire
+          '9': disappointment
+          '10': disapproval
+          '11': disgust
+          '12': embarrassment
+          '13': excitement
+          '14': fear
+          '15': gratitude
+          '16': grief
+          '17': joy
+          '18': love
+          '19': nervousness
+          '20': optimism
+          '21': pride
+          '22': realization
+          '23': relief
+          '24': remorse
+          '25': sadness
+          '26': surprise
+          '27': neutral
   - name: id
     dtype: string
   splits: