moveProjectColumn(colId, position, cb) {
      return this._request(
         'POST',
         `/projects/columns/${colId}/moves`,
         {position: position},
         cb
      );
   }
Move a column
@see https://developer.github.com/v3/projects/columns/#move-a-project-column
@param {string} colId - the column to be moved
@param {string} position - can be one of first, last, or after:<column-id>,
where <column-id> is the id value of a column in the same project.
@param {Requestable.callback} cb - will receive true if the operation is successful
@return {Promise} - the promise for the http request