Merge pull request #21000 from OliverJAsh/oja/react-router/v2/route-component-props-non-optional

React Router v2: `RouteComponentProps` non-optional `location` and `p…

types/react-router/v2/lib/Router.d.ts

@@ -83,8 +83,8 @@ declare namespace Router {
 
     interface RouteComponentProps<P, R> {
         history?: History;
-        location?: Location;
-        params?: P;
+        location: Location;
+        params: P;
         route?: PlainRoute;
         routeParams?: R;
         routes?: PlainRoute[];