[feature request] Add custom query type AAAA

[Bogdan107]

I have authoritative DNS-server, which hosts only AAAA type records, not A.
dnsmap scans only A type records.

I want option, like "--type", which helps to scan AAAA records too.

Examples:

dnsmap example.com                ; # select only A query type (by default)
dnsmap example.com --type A       ; # select only A query type
dnsmap example.com -4             ; # select only A query type
dnsmap example.com --type AAAA    ; # select only AAAA query type
dnsmap example.com -6             ; # select only AAAA query type
dnsmap example.com --type A,AAAA  ; # select A and AAAA query types
dnsmap example.com -4 -6          ; # select A and AAAA query types