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Subscribe to WebSocket notifications.

client.subscribe(function(result) {
  console.log(result);
});

Example of a notification:

[
  'justsaying',
  {
    subject: 'exchange_rates',
    body: {
      GBYTE_USD: 117.17363175179999,
      GBB_USD: 5.7415079558382
    } 
  }
]