expose close callback

[coolaj86]

You have a .close(code, data) method here:
https://github.com/websockets/ws/blob/master/lib/WebSocket.js#L100

But you don't expose the callback here:
https://github.com/websockets/ws/blob/master/lib/WebSocket.js#L121

[coolaj86]

I patched it such that if the callback is supplied it uses the callback for error instead of emitting.

#614

[Eeems]

Your pull request is failing the code checks. You'll want to update it to keep from failing. It will hopefully get merged after that?

[nikelborm]

It`s my problem