Change engine>node{4 => 6} for template (#1206)

Author: sudo-suhas

template/package.json

@@ -118,7 +118,7 @@
     "webpack-merge": "^4.1.0"
   },
   "engines": {
-    "node": ">= 4.0.0",
+    "node": ">= 6.0.0",
     "npm": ">= 3.0.0"
   },
   "browserslist": [