Require Node.js 5.x >= 5.7.0

Author: sun-zheng-an

package.json

@@ -39,6 +39,6 @@
     "through2": "^2.0.3"
   },
   "engines": {
-    "node": ">=4.8.0"
+    "node": ">=4.8.0 <5.0.0 || >=5.7.0"
   }
 }