listColumnCards(colId, cb) {
      return this._requestAllPages(`/projects/columns/${colId}/cards`, null, cb);
   }
Get information about all cards of a column
@see https://developer.github.com/v3/projects/cards/#list-project-cards
@param {string} colId - the id of the column
@param {Requestable.callback} [cb] - will receive the list of cards
@return {Promise} - the promise for the http request