xcode-install: xcode-install broken with the public Xcode 8 release

The dev center lists Xcode 8 as “released” now, so there aren’t any items in beta:

/Users/test/.gem/ruby/2.0.0/gems/xcode-install-2.0.4/lib/xcode/install.rb:309:in `prereleases': undefined method `gsub' for nil:NilClass (NoMethodError)
    from /Users/test/.gem/ruby/2.0.0/gems/xcode-install-2.0.4/lib/xcode/install.rb:251:in `fetch_seedlist'
    from /Users/test/.gem/ruby/2.0.0/gems/xcode-install-2.0.4/lib/xcode/install.rb:320:in `seedlist'
    from /Users/test/.gem/ruby/2.0.0/gems/xcode-install-2.0.4/lib/xcode/install.rb:282:in `list_versions'
    from /Users/test/.gem/ruby/2.0.0/gems/xcode-install-2.0.4/lib/xcode/install.rb:168:in `list'
    from /Users/test/.gem/ruby/2.0.0/gems/xcode-install-2.0.4/lib/xcode/install/list.rb:20:in `run'
    from /Users/test/.gem/ruby/2.0.0/gems/claide-1.0.0/lib/claide/command.rb:334:in `run'
    from /Users/test/.gem/ruby/2.0.0/gems/xcode-install-2.0.4/bin/xcversion:12:in `<top (required)>'
    from .gem/ruby/2.0.0/bin/xcversion:23:in `load'
    from .gem/ruby/2.0.0/bin/xcversion:23:in `<main>'

The Download link currently just points to a Mac App Store link, and there’s been nothing added (yet) to the Additional Downloads page. They’ve been adding other Xcode 8 downloads though, so I’d hope it will be added as it has been in the past!