trying different fetch

bot.js

@@ -2,7 +2,6 @@
 const Discord = require('discord.js');
 const auth = require('./auth.json');
 const XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
-import "isomorphic-fetch";
 
 // voice setup
 var playQueue = [];

package.json

@@ -9,6 +9,7 @@
     "es6-promise": "^4.2.5",
     "ffmpeg-binaries": "^3.2.2",
     "isomorphic-fetch": "^2.2.1",
+    "node-fetch-polyfill": "^2.0.6",
     "node-opus": "^0.2.9",
     "xmlhttprequest": "^1.8.0"
   }