Support FQDN (domain names with trailing dot)

FQDN are not recognized at all; if a domain have a trailing dot it is simply never verified; an example is the best explanation:

https://ca.rles-tub.io./mailbox
https://ca.rles-tub.io/mailbox

edit: the parser of this forum also doesn’t likes FQDN :sob:
(consider to copy the links manually instead of clicking the broken renderer)