Support DNS challenge for letsencrypt

[blark]

Hi there, thanks for this! We are running our hosts internally and do not intend on exposing any web services to the public.

Have you considered adding support for DNS-01 challenge? I could probably hack it in, but as this is your code you would likely do a better job / or might not like the way that I do it :)

[christippett]

Hey. I'm actually hoping to address this in a future update. I use the DNS challenge myself almost exclusively these days, so it'll definitely make its way into the module.