Update package.json

Author: justin808

client/package.json

@@ -4,7 +4,7 @@
   "description": "Code from the React Webpack tutorial.",
   "main": "server-express.js",
   "engines": {
-    "node": "^7.8.0 || ^8.0.0 || ^9.2.0 || ^10.0.0",
+    "node": "^7.8.0 || ^8.0.0 || ^9.2.0 || ^10.0.0 || ^11.0.0",
     "npm": "^4.4.4 || ^5.0.0",
     "yarn": "^1.0.0"
   },