Update hangup.py

Author: brianluisgomez

bandwidth/model/bxml/verbs/hangup.py

@@ -16,4 +16,4 @@ def __init__(self):
         Args:
             None
         """
-        super().__init__(tag="Hangup", content=None, attributes=None, nested_verbs=None)
+        super().__init__(tag="Hangup", content=None, attributes=None)