Issue title: Support for Chrome and Safari on IOS 
 Issue body: Still getting Webrtc not supported error message when using iOS Safari 11+ or Chrome has there been a formal release to include these browsers?
Thanks in advanced
 Comments: 
 Comment 0: Hello. While iOS Chrome does not currently support WebRTC, you should be able to use SkylinkJS with iOS Safari 11/ the latest version of iOS Safari. In case of continuing issues with this, please do let us know. Thanks!
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