code: function deliverMessage (message) {
    workerIterator((worker) => {
      if (this.process.pid === worker.process.pid) {
        return
      }
      debug('delivering message to %s', worker.process.pid)
      worker.send(message)
    })
  }
docs: Delivers the message to all the cluster workers, apart from the
  one that sends the message
  
  @method deliverMessage
  
  @param  {String}       message
  
  @return {void}