Strange behavior after barcode output. And other things

[uyu423]

1. The alignment or font size does not work properly after outputting the barcode. Are there any expected problems? And what exactly is the role of marginBottom? There is no margin under the barcode.

if (options.barcode) {
  const defaultBarcode = '100000000000'; // length 12
  const baseBarcode = `${defaultBarcode.substring(0, defaultBarcode.length - order.id.length)}${order.id}`;
  printer.align('ct').barcode(`${baseBarcode}${getParityEAN13(baseBarcode)}`, 'EAN13').marginBottom(20);
}

printer.align('rt').size(1, 1).text(moment().format('YYYY-MM-DD HH:mm:ss'), 'CP949');
printer.size(2, 2).cut();

• Exception handling is likely to be needed for the length of the barcode string. If the length of the barcode parameter is not correct or there is a problem, it just does not print. It seems to require an error message.

• I have a code for parity bit, which is the last bit of EAN13. Will Pull Request help?