def use_format(formatter, *args)
      klass = formatter.is_a?(Class) ? formatter : formatter_class(formatter)
      self.output = klass.new($stdout, *args)
    end
def use_format(formatter, *args)
      klass = formatter.is_a?(Class) ? formatter : formatter_class(formatter)
      self.output = klass.new($stdout, *args)
    end
Tell SSHKit to use the specified `formatter` for stdout. The formatter
 can be the name of a built-in SSHKit formatter, like `:pretty`, a
 formatter class, like `SSHKit::Formatter::Pretty`, or a custom formatter
 class you've written yourself.

 Additional arguments will be passed to the formatter's constructor.

 Example:

   config.use_format(:pretty)

 Is equivalent to:

   config.output = SSHKit::Formatter::Pretty.new($stdout)