Update keyboardputscancode example in README

[Stylizit]

The documentation defines the usage of keyboardputscancode as such:

var sequence = [
  { key: 'SHIFT', type: 'make',  code: SCAN_CODES['SHIFT']},
  { key: 'A',     type: 'make',  code: SCAN_CODES['A']},
  { key: 'SHIFT', type: 'break', code: SCAN_CODES.getBreakCode('SHIFT')},
  { key: 'A',     type: 'break', code: SCAN_CODES.getBreakCode('A')}
];
virtualbox.keyboardputscancode("machine_name", sequence, function keyscan_callback(err) {
    if (error) throw error;
    console.log('Sent SHIFT A');
});

But it throws an error:

VBoxManage: error: Error '[object' is not a hex byte!

To reflect the way scan-codes.js works, I think the example should be instead:

var sequence = [
  SCAN_CODES['SHIFT'][0],
  SCAN_CODES['A'][0],
  SCAN_CODES.getBreakCode('SHIFT')[0],
  SCAN_CODES.getBreakCode('A')[0]
];

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