code: function getTrending(options, callback) {
      if (!options) options = {};
  
      return this._request({
        api: '/gfycats',
        endpoint: '/trending',
        method: 'GET',
        query: {
          count: options.count || 100,
          cursor: options.cursor || null,
          tagName: options.tagName || null
        }
      }, callback);
    }
docs: Retrieve JSON array of trending GIFs for a given tag.
  If no tag name is provided, the API returns overall trending GIFs.
  
  @param {Object} options
  @param {number} options.count - number of GIFs to include per category.
  @param {string} options.cursor - cursor for pagination.
  @param {string} options.tagName - (optional) - name of the tag to get trending GIFs from.
  @param {requestCallback} callback - (optional) callback function to run when the request completes.