Support omission of DataChannels

Hi,
i try to get Audio/Video call between Chrome/Firefox/Safari and Edge. In Edge I get the following error:

`SCRIPT438: Object doesn't support property or method 'createDataChannel'`

I try it with the following code snippet:

```
var peer_options = {
initiator: initiator,
config: {
iceTransportPolicy: 'all',
//rtcpMuxPolicy: 'negotiate',
iceServers: [
{ urls: 'turn:xyz.bar:3478', username: 'user', credential: 'pass'},
]
},
};
if( this.videoSupport ) {
peer_options.stream = this.localStream;
}

this.RTCPeer = new SimplePeer( peer_options );

```

I don't need DataChannel. How to disable DataChannel in simplepeer so I can made a audio/video call between Edge and other browser?

Thank You!