Underscores in URLs seem to break the validator

[chalbersma]

URLs can have underscores in the subdomain and be valid. https://stackoverflow.com/questions/2180465/can-domain-name-subdomains-have-an-underscore-in-it URLs with underscores are incorrectly identified as not being URLs.

Example of the failure :

>>> validators.url("https://sample_subdomain.example.com")
ValidationFailure(func=url, args={'value': 'https://sample_subdomain.example.com', 'public': False})
>>> validators.url("https://sample-subdomain.example.com")
True

[chalbersma]

I'm not sure where exactly this would need to be added to the pattern but I assume it's somewhere here : https://github.com/kvesteri/validators/blob/master/validators/url.py#L74