def relevant_configuration_file(options)
      if options[:config_file]
        options[:config_file]
      elsif File.exist?(Config::FILE_NAME)
        Config::FILE_NAME
      elsif File.exist?(Config.user_file)
        Config.user_file
      end
    end
def relevant_configuration_file(options)
      if options[:config_file]
        options[:config_file]
      elsif File.exist?(Config::FILE_NAME)
        Config::FILE_NAME
      elsif File.exist?(Config.user_file)
        Config.user_file
      end
    end
Return the path of the configuration file that should be loaded.

 @param options [Hash]
 @return [String]