Add support for service Health query with multi tags

[cablehead]

#124

[pgrzesik]

What is the status of this issue ? Is the work started somewhere ?

[cablehead]

I believe the status is not started. Pretty sure this is just a 2-3 line patch, a doc string update and a test, if you'd like to open a pull request.

[pgrzesik]

Well, actually it was 3 line patch, but I didn't realise that to execute those kind of queries you have to prepare them first using https://www.consul.io/docs/agent/http/query.html#general so I guess this issue is much more broad and it's possible to create such queries using Consul.Query.

[sebito91]

Hey folks, this looks to have been resolved a lot more recently (v.1.3.0 as of late 2018). It looks like we're still pending a fix here, happy to contribute if we need.