Update readme

dataset_infos.json

@@ -476,7 +476,7 @@
                 "_type": "Value",
                 "dtype": "string"
             }
-        }
-    },
-    "description": "Cross-lingual natural language inference task (XNLI)."
+        },
+        "description": "Cross-lingual natural language inference task (XNLI)."
+    }
 }