fix linting errors

Author: Gaurav0

node-tests/.eslintrc.js

@@ -2,7 +2,11 @@
 
 module.exports = {
   root: true,
-  extends: 'eslint:recommended',
+  extends: ['eslint:recommended'],
+  parserOptions: {
+    ecmaVersion: 2017,
+    sourceType: 'module'
+  },
   env: {
     node: true,
     mocha: true

node-tests/test.js

@@ -12,6 +12,7 @@ var execSync = require('child_process').execSync;
 var chromeVersion = execSync('google-chrome --product-version').toString();
 var browser = 'Chrome ' + chromeVersion.split('.').slice(0, 2).join('.');
 var path = require('path');
+var Promise = require('rsvp').Promise;
 
 describe('ember-cli-eslint', function() {
   this.timeout(60000);