Upgrade minimum Node version to 20 (#48) (#49)

Author: mattfsourcecode

package.json

@@ -5,7 +5,7 @@
   "main": "dist/index.js",
   "license": "MIT",
   "engines": {
-    "node": ">=18.0.0"
+    "node": ">=20.0.0"
   },
   "repository": {
     "type": "git",