def add_appenders( *args )
      args.flatten.each do |arg|
        o = arg.kind_of?(::Logsly::Logging182::Appender) ? arg : ::Logsly::Logging182::Appenders[arg.to_s]
        raise ArgumentError, "unknown appender #{arg.inspect}" if o.nil?
        @appenders << o unless @appenders.include?(o)
      end
      self
    end
def add_appenders( *args )
      args.flatten.each do |arg|
        o = arg.kind_of?(::Logsly::Logging182::Appender) ? arg : ::Logsly::Logging182::Appenders[arg.to_s]
        raise ArgumentError, "unknown appender #{arg.inspect}" if o.nil?
        @appenders << o unless @appenders.include?(o)
      end
      self
    end
call-seq:
    add_appenders( appenders )

 Add the given _appenders_ to the list of appenders, where _appenders_
 can be either a single appender or an array of appenders.