Fix updatetAt update

src/libs/routes/simulation.js

@@ -139,7 +139,7 @@ simulationApp.put('/:id', passport.authenticate('bearer', { session: false }), (
 
         simulation.content = req.body.content || simulation.content;
         simulation.name = req.body.name || simulation.name;
-        simulation.updatedAt = Date.now;
+        simulation.updatedAt = Date.now();
 
         simulation.save((err) => {
             if(err) {