Update node version in readmin and package.json

Author: Ivan Kamkin

codegen/Templates/nodejs/docs/tsconfig.mustache

@@ -27,6 +27,10 @@ This repository contains Aspose.BarCode Cloud SDK for Node.js source code.
 
 To use these SDKs, you will need Client Id and Client Secret which can be looked up at [Aspose Cloud Dashboard](https://dashboard.aspose.cloud/applications) (free registration in Aspose Cloud is required for this).
 
+## Requirements
+
+- Node.js 18 or later (native `fetch` required).
+
 ## How to use the SDK
 
 The complete source code is available in this repository folder. You can either directly use it in your project via source code or get [nmpjs distribution](https://www.npmjs.com/package/aspose-barcode-cloud-node) (recommended).

codegen/Templates/nodejs/package.mustache

@@ -129,7 +129,7 @@
     "dist"
   ],
   "engines": {
-    "node": ">=16"
+    "node": ">=18"
   },
   "scripts": {
     "test": "npx jest",