http://[ffff::] deemed invalid incorrectly

[RedChen]

From abnf_regexp.py#110
should be changed from
IPv6_RE = '(({0})|({1})|({2})|({3})|({4})|({5})|({6})|({7}))'.format( *variations )

to

IPv6_RE = '(({0})|({1})|({2})|({3})|({4})|({5})|({6})|({7})|({8}))'.format( *variations )

So, the rule

[ *6( h16 ":" ) h16 ] "::"

could be applied

[sigmavirus24]

I would merge a pull request that fixes this.

[sigmavirus24]

Fixed in #34