Add @ember/optional-features dependency

Author: Turbo87

package-lock.json

@@ -30,6 +30,7 @@
   },
   "devDependencies": {
     "@ember/jquery": "^1.1.0",
+    "@ember/optional-features": "^1.3.0",
     "babel-plugin-transform-object-rest-spread": "^6.23.0",
     "broccoli-asset-rev": "^3.0.0",
     "ember-a11y-testing": "^2.0.0",