Update app.js

@@ -71,7 +71,7 @@ app.post('/webhook', line.middleware(config), (req, res) => {
     })
 });
 // event handler
-function handleEvent(event) {
+async function handleEvent(event) {
     console.log(event.type);
   console.log(event.message);
 
@@ -81,7 +81,7 @@ function handleEvent(event) {
     return Promise.resolve(null);
   }
   else if (event.type == 'message'&& event.message.type == 'image') {
-    return new Promise(async(resolve,reject)=>{
+    return new Promise((resolve,reject)=>{
       console.log("!");
       var cheerio = require('cheerio');
       
@@ -89,7 +89,7 @@ function handleEvent(event) {
       let endpoint = process.env['COMPUTER_VISION_ENDPOINT'];
       console.log("?");
       var uriBase = endpoint + 'vision/v2.1/ocr';
-      var options = {
+       var options = {
         uri: uriBase,
         qs: {
           visualFeatures: 'Categories', 
@@ -102,7 +102,9 @@ function handleEvent(event) {
         },
         body: event.message.image
       };
-      await request.post(options, function (error, response, body) {
+
+    }).then(
+      request.post(options, function (error, response, body) {
         var data=JSON.stringify(body);  
         var text='';
         console.log(data);
@@ -137,8 +139,7 @@ function handleEvent(event) {
             }
             client.replyMessage(event.replyToken,result).then(resolve).catch(reject);
           });
-      });
-    })
+      }))
   }
   else if(event.type == 'message' && event.message.type == 'text')
   {