update required node version to 14.15.4

Author: jaeh

package.json

@@ -9,7 +9,7 @@
   "module": "src/index.mjs",
   "type": "module",
   "engines": {
-    "node": ">=14.2.0"
+    "node": ">=14.15.4"
   },
   "engineStrict": true,
   "scripts": {
@@ -54,4 +54,4 @@
       "github": "jaeh"
     }
   ]
-}
+}