Bug, hostname with trailing dot throws exception

[plejon]

Throws error when hostnames has trailing dot.
Example usage is for pushing records to Azure DNS.

import validators
validators.domain('example.com.')
ValidationFailure(func=domain, args={'value': 'example.com.'})
validators.__version__
'0.18.2'

[paulmillar]

Just to mention, a web page dedicated to trailing dots in domain name. There is also this related Stack Overflow question. Both make it clear that a URL, where the authority part has a FQDN with a final dot, is a valid URL.

[nandgator]

duplicate of #124