Use native node.js fetch (#53)

package.json

@@ -1,11 +1,12 @@
 {
-  "name": "getting-started",
+  "name": "discord-getting-started",
+  "private": true,
   "version": "1.0.0",
   "description": "Discord example app",
   "main": "app.js",
   "type": "module",
   "engines": {
-    "node": "16.x"
+    "node": ">=18.x"
   },
   "scripts": {
     "start": "node app.js",
@@ -17,8 +18,7 @@
   "dependencies": {
     "discord-interactions": "^3.2.0",
     "dotenv": "^16.0.3",
-    "express": "^4.18.2",
-    "node-fetch": "^3.3.0"
+    "express": "^4.18.2"
   },
   "devDependencies": {
     "nodemon": "^2.0.15"