def ldiff(license)
      xml = Nokogiri::XML(File.open(@path), &:noblanks)
      comment = xml.xpath('/comment()')[0]
      now = comment.nil? ? '' : comment.text.to_s.strip
      ideal = license.strip
      differ(ideal, now)
    end
def ldiff(license)
      xml = Nokogiri::XML(File.open(@path), &:noblanks)
      comment = xml.xpath('/comment()')[0]
      now = comment.nil? ? '' : comment.text.to_s.strip
      ideal = license.strip
      differ(ideal, now)
    end
Return the difference for the license.