* Use certmagic for challenge validation
* WIP
* Get the correct key
* Override preflight check logic
* Fix logging for imported packages and tidy config.cfg
* Fix test and add docstrings
* Update README
* When appending the SOA for authoritative NXDOMAIN responses, it needs to go in
the Authoritative section, not the Answer section.
This fixes the acme-dns validation for the lego Let's Encrypt client.
* Respond case-insensitively to A and SOA requests. Add corresponding tests.
This fixes the autocert feature with Let's Encrypt, because Let's Encrypt does
a lookup for the A record with a deliberately mangled case.
* Support for multiple TXT records per subdomain and database upgrade functionality
* Linter fixes
* Make sure the database upgrade routine works for PostgreSQL
* Move subdomain query outside of the upgrade transaction