getProjectColumn(colId, cb) {
      return this._request('GET', `/projects/columns/${colId}`, null, cb);
   }
Get information about a column
@see https://developer.github.com/v3/projects/columns/#get-a-project-column
@param {string} colId - the id of the column
@param {Requestable.callback} cb - will receive the column information
@return {Promise} - the promise for the http request