non-compliant device : DENON/Marantz streamers

[fredele]

Well, no a real issue, but it took me some time to figure out how to use this library with
a DENON streamer ...

In order to use this Library in python 3,

I have encoutered this issue:

non-comploant device

which I have rapidly corrected with a hack ...

I also had to replace in :
upnpclient/soap.py

on line 99
"SOAPAction": '"%s#%s"' % (self.service_type, action_name)
to :
"SOAPAction": '"{}#{}"'.format(self.service_type, action_name)

on line 101
"Content-Type": "text/xml",
to :
"Content-Type": "text/xml; charset=utf-8",

Now, it works fine ... maybe can it help someone ?...