code: function PORTportcheckerco () {
    const self = this
    self.getPortOpen = (port, cb) => {
      request({
        url: 'https://portchecker.co/check',
        method: 'POST',
        body: 'port=' + port
      }, (err, _, body) => {
        if (err) return cb(err)
        const m = body.match(/Port \d+ is <span class=".+">([a-z]+)<\/span>/i)
        if (!m) return cb(new Error('Invalid response'))
        return cb(null, m[1] === 'open')
      })
    }
  }
docs: /* getPortOpen