Remove unnecessary decode (#336)

Co-authored-by: Tzu Lin, Huang <babyduck.tw@gmail.com>

Author: twbabyduck

examples/managing-audiences/test_audienceGroup.py

@@ -52,7 +52,7 @@ def get_audience_gid_by_name(self, description, timeout=None):
         audience_groups = super(LineBotApi, self).get_audience_group_list(
             description=description, timeout=timeout)
         for audience_group in audience_groups:
-            if audience_group.description.encode('utf-8') == description:
+            if audience_group.description == description:
                 return audience_group.audience_group_id
         else:
             return None