The package python-certbot-dns-rfc2136 0.24.0-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/python-certbot-dns-rfc2136 -- More information about python-certbot-dns-rfc2136: http://pkg.kali.org/pkg/python-certbot-dns-rfc2136