print the used nameserver

[x70b1]

It would be cool if dog shows the used nameserver to query.

If a nameserver is specified, it is clear of course.

But especially if no nameserver is specified, it would be helpful to know which nameserver was chosen. dig also shows this info.

[ogham]

I can see this feature being useful. #63 is also output-related.

[0x5c]

I've just now discovered dog and it's a pretty neat tool, but the inability to see who was the resolver is the only limitation to switching away from dig and its ugly output.

[Nemo157]

Also, very useful in cases where you query multiple nameservers, per-line so you can see which nameserver returned each result:

> dog @1.1.1.1 @134.195.4.2 A google.com
A google.com. 3m41s   142.250.181.238
A google.com. 4m36s   172.217.168.206