Replace YAML keys from int to str

README.md

@@ -54,9 +54,9 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: meaning
-          1: fluency
-          2: simplicity
+          '0': meaning
+          '1': fluency
+          '2': simplicity
   - name: worker_id
     dtype: int32
   - name: rating