Update app.js

@@ -72,6 +72,7 @@ app.post('/webhook', line.middleware(config), (req, res) => {
 });
 });
 // event handler
 // event handler
 function handleEvent(event) {
 function handleEvent(event) {
+    console.log(event.type);
   console.log(event.message);
   console.log(event.message);