Add deprecated RoutingContext export to index

Author: alexlande

modules/index.js

@@ -18,6 +18,7 @@ export RouteContext from './RouteContext'
 export useRoutes from './useRoutes'
 export { createRoutes } from './RouteUtils'
 export RouterContext from './RouterContext'
+export RoutingContext from './RoutingContext'
 export PropTypes from './PropTypes'
 export match from './match'
 export useRouterHistory from './useRouterHistory'