fix hmr

Author: bertho-zero

src/client.js

@@ -111,7 +111,7 @@ initSocket();
   if (module.hot) {
     module.hot.accept('./routes', () => {
       const nextRoutes = require('./routes');
-      hydrate(nextRoutes).catch(err => {
+      hydrate(nextRoutes.__esModule ? nextRoutes.default : nextRoutes).catch(err => {
         console.error('Error on routes reload:', err);
       });
     });