Add as an external plugin to coredns

[jmb]

This plugin is great!

Could it be submitted to the CoreDNS list of external plugins perhaps?

https://coredns.io/2017/07/23/add-external-plugins/

[icyflame]

@jmb Thanks for the suggestion, it is a good idea! I opened a PR to coredns.io adding this as an external plugin.