chore: update the changelog format to thank contributors (#381)

Author: vicb

.changeset/config.json

@@ -1,6 +1,11 @@
 {
   "$schema": "https://unpkg.com/@changesets/config@3.0.3/schema.json",
-  "changelog": ["@changesets/cli/changelog", { "repo": "opennextjs/opennextjs-cloudflare" }],
+  "changelog": [
+    "@changesets/changelog-github",
+    {
+      "repo": "opennextjs/opennextjs-cloudflare"
+    }
+  ],
   "commit": false,
   "fixed": [],
   "linked": [],