message: Ensure verification QR codes use the right buffer size
  The string length buffer only needs 2 bytes, not 4.
diff: @@ -126,7 +126,7 @@ export default class VerificationQRCode extends React.PureComponent {
  buf = Buffer.concat([buf, tmpBuf]);
  };
  const appendInt = (i: number) => {
  - const tmpBuf = Buffer.alloc(4);
  + const tmpBuf = Buffer.alloc(2);
  tmpBuf.writeInt8(i, 0);
  buf = Buffer.concat([buf, tmpBuf]);
  };
  