code: function loadWithPromise (options) {
    return new Promise((resolve, reject) => {
      loadWithCallback(options, (error, config) => {
        if (error) {
          reject(error)
        } else {
          resolve(config)
        }
      })
    })
  }
docs: Wrap loadWithCallback with Promise
  
  @param {module:CloudConfigClient~Options} options - spring client configuration options
  @returns {Promise<module:Config~Config, Error>} promise handler