code: function purgeCache(options) {
      return getZone(options.domain).then(function (zone) {
        let query = (options._[1]) ? {files: options._.slice(1)} : {purge_everything: true};
        return self.cloudflareClient.purgeCache(zone.id, query);
      }).then(function () {
        return new Result('Purged cache successfully');
      });
    }
docs: Purge files from cache
  @param options
  @returns {Promise}