code: function urlToBase64 (url) {
    return new Promise((resolve, reject) => {
      request.get(url, (err, response, body) => {
        err && reject(err)
        resolve(body.toString('base64'))
      })
    })
  }
docs: Reads an image from url and convert it to base64
  @param {string} url
  @returns {Promise}