code: function getTrendingCategories(options, callback) {
      if (!options) options = {};
  
      return this._request({
        api: '/reactions',
        endpoint: '/populated',
        method: 'GET',
        query: {
          gfyCount: options.gfyCount || 1,
          cursor: options.cursor || null,
          tagName: options.tagName || 'trending'
        }
      }, callback)
    }
docs: Retrieve JSON array of GIFs in a specific category/reaction specified by tagName.
  
  Note: with the exception of "trending" category,
  GIFs belonging to all other reaction categories can be retrieved using the search endpoint.
  If the search term used is a category/reaction name, the search API will automatically give
  precedence to GIFs that belong in that category.
  
  @param {Object} options
  @param {number} options.gfyCount - number of GIFs to return.
  @param {string} options.cursor - cursor for pagination.
  @param {string} options.tagName - name of the category/reaction.
  @param {requestCallback} callback - (optional) callback function to run when the request completes.