code: function makeWorker(worker) {
      return {
        seneca: Seneca().client(worker),
        id: worker.id,
        up: undefined,
        lastCallDuration: -1,
        meanCallDuration: -1,
        host: worker.host,
        port: worker.port,
        type: worker.type
      }
    }
docs: Make a worker and put it in our `workers` object