origin() does not keep IPv6 brackets #504
Description
For example:
>>> u = URL('http://[::1].org:8080')
>>> u
URL('http://[::1]:8080')
>>> u.origin()
URL('http://::1:8080')
{{ message }}
For example:
>>> u = URL('http://[::1].org:8080')
>>> u
URL('http://[::1]:8080')
>>> u.origin()
URL('http://::1:8080')