[meta] add missing engines.node

Author: ljharb

package.json

@@ -79,5 +79,8 @@
     "safe-publish-latest": "^2.0.0",
     "tape": "^5.6.3",
     "uglify-js": "2.7.3"
+  },
+  "engines": {
+    "node": ">= 0.4"
   }
 }