code: public function color256($code, $option = self::COLORS_256_FOREGROUND)
      {
          if (!$this->isSupportedColors256()) {
              throw new InvalidArgumentException('No supported colors 256.');
          }
  
          $attrs = [$option, 5, $code];
          $this->mergeToCurrent($attrs);
  
          return $this;
      }
docs: @param int $code
  @param int $option
  
  @throws InvalidArgumentException
  
  @return $this