message: Use the right function for creating binary verification QR codes
  `writeInt8` happened to work because the strings we're writing happen to fit within a single byte so the LSB doesn't matter. We actually want a 16 bit (2 byte) number in big-endian format.
diff: @@ -127,7 +127,7 @@ export default class VerificationQRCode extends React.PureComponent {
  };
  const appendInt = (i: number) => {
  const tmpBuf = Buffer.alloc(2);
  - tmpBuf.writeInt8(i, 0);
  + tmpBuf.writeInt16BE(i, 0);
  buf = Buffer.concat([buf, tmpBuf]);
  };
  const appendStr = (s: string, enc: string, withLengthPrefix = true) => {
  