Replace YAML keys from int to str (#1)

- Replace YAML keys from int to str (f6f998dcb9ec4f79c8f8cdb2a9e7092b794c7954)

README.md

@@ -29,8 +29,8 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: entailment
-          1: non-entailment
+          '0': entailment
+          '1': non-entailment
   - name: parse_premise
     dtype: string
   - name: parse_hypothesis