Fix mock data

.roadhogrc.mock.js

@@ -59,7 +59,7 @@ const proxy = {
     $body: postRule,
   },
   'POST /api/forms': (req, res) => {
-    res.send('Ok');
+    res.send({ message: 'Ok' });
   },
   'GET /api/tags': mockjs.mock({
     'list|100': [{ name: '@city', 'value|1-100': 150, 'type|0-2': 1 }]