code: function notify () {
    debug('run checker')
    debug(`ELINT_DISABLE_UPDATE_NOTIFIER: ${process.env.ELINT_DISABLE_UPDATE_NOTIFIER}`)
  
    if (process.env.ELINT_DISABLE_UPDATE_NOTIFIER === 'true') {
      return Promise.resolve(null)
    }
  
    return checker().then(result => {
      if (!result || !result.name || !result.latest || !result.current) {
        return null
      }
  
      conf.update(result.name)
  
      return report(result)
    })
  }
docs: 获取更新通知
  
  @returns {Promise<string>} 用于输出的内容