Update xterm and nodejs versions

frontend/.nvmrc

@@ -1,2 +1,2 @@
-7.9.0
+12.4.0
 

frontend/package.json

@@ -23,7 +23,7 @@
     "source-map-loader": "0.2.2",
     "style-loader": "0.19.0",
     "webpack": "3.7.1",
-    "xterm": "2.9.2"
+    "xterm": "3.14.4"
   },
   "devDependencies": {
     "copy-webpack-plugin": "4.5.1"

frontend/tty-receiver/main.js

@@ -1,5 +1,5 @@
 import 'xterm/dist/xterm.css';
-import Terminal from 'xterm';
+import { Terminal } from 'xterm';
 import pbkdf2 from 'pbkdf2';
 
 import React from 'react';