Add support for Node.js 20 (#225)

Author: jhae-de

__tests__/index.test.mjs

@@ -1,4 +1,4 @@
-import { beforeEach, describe, it } from 'node:test';
+import { beforeEach, describe, it } from 'node:test'; // eslint-disable-line n/no-unsupported-features/node-builtins
 import assert from 'node:assert/strict';
 import { readFileSync } from 'node:fs';
 

package-lock.json

@@ -50,6 +50,6 @@
     }
   },
   "engines": {
-    "node": ">=22"
+    "node": ">=20"
   }
 }