This module used to depend on domain_version, which is no longer supported. domain_version automatically maintained
TXT record with meta information, and the subdomain's SOA record.
Since version 7.n.n, the TXT meta record only contains the information supplied in the variable additional_meta,
and the SOA record is no longer maintained.
When switching from an earlier version to version 7.0.0 or higher Terraform will remove the
SOA record. The user should add a replacement by hand, and maintain it (if desired) where this
module was used.
Users should add repository information (which was added automatically to the TXT meta record before) by hand, if desired.
In a later version, we might add support for the SOA record back in here, but then without
a dependency on domain_version and, indirectly, JavaScript.