suggestion: domain input validation

[andrzej-woof]

passing values that are not a valid domain cause various errors to be returned e.g.:

• google..com -> dig: 'google..com' is not a legal name (empty label)
• await dnsRecords.getDnsRecords([null, 'google.com'], 'MX') -> Error: ;; Warning, extra type option

I assume there might be more. This is a bit painful when dealing with large arrays since the entire batch is rejected if one entry is invalid.

[AndreiIgna]

hey @andrzej-woof the v2 of the library has some basic domain checking now. v2 comes with some breaking changes too, so check out the full change log too.
Maybe this is helpful if you're still using it