def configured_require_paths
      return ['lib'] if directory.empty?
      return [File.join(directory, 'lib')] if config.require_paths.empty?
      config.require_paths.map{|p| File.join(directory, p)}
    end
def configured_require_paths
      return ['lib'] if directory.empty?
      return [File.join(directory, 'lib')] if config.require_paths.empty?
      config.require_paths.map{|p| File.join(directory, p)}
    end
Get additional require paths defined in the configuration.

 @return [Array<String>]