code: function getTrendingTags(options, callback) {
      if (!options) options = {};
  
      return this._request({
        api: '/tags',
        endpoint: '/trending',
        method: 'GET'
      }, callback);
    }
docs: Retrieve JSON array of trending tags.
  
  @param {Object} options
  @param {string} options.cursor - cursor for pagination.
  @param {requestCallback} callback - (optional) callback function to run when the request completes.