Update conference.py

Author: brianluisgomez

bandwidth/model/bxml/verbs/conference.py

@@ -19,7 +19,7 @@ class Conference(Verb):
 
     def __init__(
         self, audio_and_recording_verbs: List[Union[PlayAudio, SpeakSentence, StartRecording, StopRecording, PauseRecording, ResumeRecording]] = [],
-        name: str=None, mute: str=None, 
+        name: str, mute: str=None, 
         hold: str=None, call_ids_to_coach: str=None, 
         conference_event_url: str=None, conference_event_method: str=None, 
         conference_event_fallback_url: str=None, conference_event_fallback_method: str=None,