Overload keys?

[oxinabox]

I had been wondering what my Node contained.
I figured since this package supports getindex it would also support keys.
But that method errors:

julia> ann = parse(Node, ann_str)
Node Document (1 child)

julia> keys(ann)
ERROR: MethodError: no method matching keys(::Node)

[joshday]

Fixed on master! New release momentarily