Update app.js

@@ -185,3 +185,6 @@ function handleEvent(event) {
  app.listen(3000, function () {
  app.listen(3000, function () {
   console.log('Linebot listening on port 3000!');
   console.log('Linebot listening on port 3000!');
 });
 });
+app.get('/',(req,res)=>{
+    res.send("hellow");
+})