Replace YAML keys from int to str (#2)

- Replace YAML keys from int to str (18a4da5fd361d054570b48209764c7bcc2c49f76)

README.md

@@ -39,10 +39,10 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: a
-          1: b
-          2: c
-          3: d
+          '0': a
+          '1': b
+          '2': c
+          '3': d
   - name: choice_type
     dtype: string
   - name: exp