[feature request] Select target dns server for resolving

[Bogdan107]

I have remote DNS resolver, which hosts some domain zone "example.com". I want scan al subdomains of "example.com", by sending dns queries directly to custom resolver "ns1.example.com", not to my system resolver.

What I want:

• option, like "--resolver", "--nameserver" or any other, which helps to use custom domain resolver.

Example: dnsmap example.com --resolver ns1.example.com