Merge remote-tracking branch 'origin/feature_thumbnail'

@@ -7,6 +7,7 @@ exports.check = function(message,replyToken){
         'tp1uoFAfgHE', 'Qx22TnVVIfU', '3y1QIqR115A', 'VXBI1wt8XII', 'aWMBn2--E0Q', 'HyTbgBlnLCo'];
 
     const request = require('request');
+    const fs = require('fs');
     const TARGET_URL = 'https://api.line.me/v2/bot/message/reply'
     
     
@@ -52,6 +53,11 @@ exports.check = function(message,replyToken){
                             "messages":
                             [
                                 {
+                                    "type": "image",
+                                    "originalContentUrl": "https://img.youtube.com/vi/"+ids[rand_0to9]+"/hqdefault.jpg",
+                                    "previewImageUrl": "https://img.youtube.com/vi/"+ids[rand_0to9]+"/hqdefault.jpg"
+                                },
+                                {
                                     "type": "text",
                                     "text": sendMessage
                                 }