Implement the NPM engines field

Author: xavierfoucrier

package-lock.json

@@ -23,6 +23,10 @@
     "url": "https://github.com/mojs/mojs.github.io/issues"
   },
   "homepage": "https://mojs.github.io/",
+  "engines": {
+    "node": "^18",
+    "npm": "^8"
+  },
   "devDependencies": {
     "cache-loader": "^4.1.0",
     "cross-env": "^7.0.3",