add missing 'routes' property to application

express/express.d.ts

@@ -1076,6 +1076,16 @@ interface ExpressApplication {
     map: any;
 
     locals: any;
+
+    /**
+     * The app.routes object houses all of the routes defined mapped by the
+     * associated HTTP verb. This object may be used for introspection
+     * capabilities, for example Express uses this internally not only for
+     * routing but to provide default OPTIONS behaviour unless app.options()
+     * is used. Your application or framework may also remove routes by
+     * simply by removing them from this object.
+     */
+    routes: any;
 }
 
 interface Express extends ExpressApplication {