feat(#28): add support for server.address()

[srghma]

No description provided.

[srghma]

@garyb @hdgarrood ping...

[srghma]

I dont want to be pesky, but this pr is an exact copy of a function from https://github.com/purescript-node/purescript-node-net/blob/1fd91c872ecff202ae86b848f2c8d054f7a751f3/src/Node/Net/Server.purs#L72-L88

I hope this simplifies review, I have already tested it in my fork of hyper purescript-hyper/hyper#94

[srghma]

@hdgarrood updated

but it's also possible to implement this without duplicating the code

... -- export address from here and Address from Net

address = unsafeCoerce Net.adress

but Server is different, so it's better to duplicate the code

[hdgarrood]

Thanks, we will try to get to this after v0.14.0 is released.

[jamesdbrock]

This PR looks good to me.

[JordanMartinez]

Superceded by #49.