Add query tag for http_request_total

[nutsoriginal]

I found that README.md has example of http_request_total with query tag

http_request_total{host="dev.to",port="443",method="GET",query="/amplifr"} 145.0

But actual code does not have this tag

[Envek]

Hey, thanks for the pull request.

One thing that bother me here is that query value can have very high and practically unlimited number of possible values, and monitoring systems doesn't like high cardinality time series (for an example see Prometheus' docs for metric labels). So it can be a bit dangerous.

@dsalahutdinov, can you recall any details on query tag absense from implementation?