Release notes

docs/releases.md

@@ -9,6 +9,7 @@ and the [ntfy Android app](https://github.com/binwiederhier/ntfy-android/release
 * Upgrade Android dependencies to SDK 33 (no ticket)
 * Android 13: Ask for permission to post notifications ([#508](https://github.com/binwiederhier/ntfy/issues/508))
 * Remove timestamp when copying message text ([#471](https://github.com/binwiederhier/ntfy/issues/471), thanks to [@wunter8](https://github.com/wunter8))
+* Fix auto-delete if some icons do not exist anymore ([#506](https://github.com/binwiederhier/ntfy/issues/506))
 
 **Additional translations:**