TwilioVoice.disconnect() does not play disconnect tone

[gentleShark]

On Android (and possibly iOS also though I haven't tested) TwilioVoice.disconnect() successfully terminates the call play but does not play an audio tone to convey to the user that the call has been terminated.

[gentleShark]

the twilio java quickstart implements this by playing disconnect.wav in the raw resources directory but I didn't have much luck importing that file, modifying SoundPoolManager.java considerably, and modifying the TwilioVoiceManager.java disconnect function. my react native app still works but no dissconnect.wav sound

[gentleShark]

I just created a pull request for this issue: #113

[jdegger]

I will be closing this issue so we can continue the discussion on #133