feat: enforce node version 20

Author: QuantGeekDev

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mcp-framework",
-"version": "0.1.21",
+  "version": "0.1.22",
   "description": "Framework for building Model Context Protocol (MCP) servers in Typescript",
   "type": "module",
   "author": "Alex Andru <[email protected]>",
@@ -24,6 +24,9 @@
     "watch": "tsc --watch",
     "prepare": "npm run build"
   },
+  "engines": {
+    "node": ">=20.0.0"
+  },
   "keywords": [
     "mcp",
     "claude",