TTL refresh etcd 2.3.x+ broken

[thebigredgeek]

If you want to refresh a TTL on 2.3.x+, you cannot send a key with the SET operation. There doesn't appear to be a way to do that with this lib

[felipejfc]

    this.client.set(p,
      val,
      {
        prevExist: true,
        ttl: this.expire
      }
    )

[thebigredgeek]

Yea, we need to add compatibility for later versions of etcd. PRs welcome

[felipejfc]

unfortunately this lib seems pretty dead to me, don't know if a PR would worth it...