Added missing promises

react-datagrid/react-datagrid.d.ts

@@ -4,6 +4,7 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 /// <reference path="../react/react.d.ts"/>
+/// <reference path="../es6-promise/es6-promise.d.ts"/>
 
 declare module "react-datagrid" {
     import DataGrid = ReactDataGrid.DataGrid;