feature request: custom ip for doh domain

[lessload]

your apps so good.
for some diagnostic use case i need to custom ip for @https://dns.customdomain.net , now i need to custom host file for it.
It would be great if your apps support it

[rahilarious]

This could be very easy by editing /etc/hosts file. But it seems since this is a Go package it doesn't respect it. So as a workaround if somebody really want to quickly test specific ip.

1. edit /etc/hosts with your custom ip for domain (i.e. 2.3.4.5 dns.customdomain.net)
2. curl --verbose --doh-url https://dns.customdomain.net/dns-query <domain-to-query>
3. Check the start of output