Add the supported version information of Node.js and Node-RED

Author: kazuhitoyokoi

templates/subflow/package.json.mustache

@@ -7,7 +7,11 @@
     "{{name}}"{{^last}}, {{/last}}
     {{/keywords}}
   ],
+  "engines": {
+    "node": ">=12.0.0"
+  },
   "node-red": {
+    "version": ">=1.3.7",
     "nodes": {
       "{{&nodeName}}": "subflow.js"
     }