ETCD3 Module

Hi Folks,

I’m looking on module etcd3 and I missed a way to get a stored data on Etcd using v3 api.
So, I made a small change on module to support that (https://gist.github.com/vasartori/c2ec99d1a71d9cbcd84ed7269fe48c0b) .

Has a PR or anybody working on the same thing?