message: just block forever
diff: const { spawnHub } = require('../main');
  -const { waitForExit } = require('../util/process');
  module.exports = {
  name: 'hub:start',
  @@ -17,8 +16,8 @@ module.exports = {
  ],
  async run(args) {
  - let proc = spawnHub(this.project.pkg.name, this.project.configPath(), args.environment);
  - await waitForExit(proc);
  + await spawnHub(this.project.pkg.name, this.project.configPath(), args.environment);
  + await new Promise(() => {});
  }
  };
  