refactor: 💡 upgrade addons/core to Ember 3.24

addons/core/ember-cli-build.js

@@ -1,6 +1,6 @@
-"use strict";
+'use strict';
 
-const EmberAddon = require("ember-cli/lib/broccoli/ember-addon");
+const EmberAddon = require('ember-cli/lib/broccoli/ember-addon');
 
 module.exports = function (defaults) {
   let app = new EmberAddon(defaults, {