update loading script

hc4.py

@@ -38,7 +38,7 @@ class Hc4(datasets.GeneratorBasedBuilder):
         ]
 
     def _generate_examples(self, filepath):
-        with gzip.open(filepath, encoding="utf-8") as f:
+        with gzip.open(filepath) as f:
             for key, row in enumerate(f):
                 data = json.loads(row)
                 yield key, data