module Jekyll
  module Tags
    class IncludeRootTag < IncludeTag
      def resolved_includes_dir(context)
        '.'.freeze
      end
    end
  end
end

Liquid::Template.register_tag('include_root', Jekyll::Tags::IncludeRootTag)

module Jekyll
  module Tags
    class IncludeRootTag < IncludeTag
      def tag_includes_dirs(context)
        ['.'].freeze
      end
    end
  end
end

Liquid::Template.register_tag('include_root', Jekyll::Tags::IncludeRootTag)

Update IncludeRootTag for Jekyll 3.3
Update IncludeRootTag for Jekyll 3.3

They love to change the API
