info: handle git:// URLs in origin remote

The URL being constructed is only able to extract the correct username
when git@ or https:// URLs are found as the origin remote. This change
allows git:// to be used as well.

Signed-off-by: Maurice Kelly <osv-github@chatswood.org.uk>

Closes Homebrew/homebrew#11670.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Homebrew/cmd/info.rb

@@ -22,7 +22,7 @@ module Homebrew extend self
 
   def github_fork
     if system "/usr/bin/which -s git"
-      if `git remote -v` =~ %r{origin\s+(https?://|git@)github.com[:/](.+)/homebrew}
+      if `git remote -v` =~ %r{origin\s+(https?://|git(?:@|://))github.com[:/](.+)/homebrew}
         $2
       end
     end