Added travis ci support for modern node versions

[kriskowal]

Let’s keep 0.10. There’s an awful lot of that in production systems. I’m adding you as a collaborator so you can manage this yourself.

[amilajack]

Thanks! Added it back. Do you also mind if I updated the readme to es6?

[kriskowal]

@amilajack I’d be fine with adding a section describing the ES6 equivalent syntax. The future is not distributed evenly.

[amilajack]

Sounds good!