📝 Update release notes

release-notes.md

@@ -10,6 +10,10 @@
 * 🔧 Add `ENV PYTHONUNBUFFERED=1` to log output directly to Docker. PR [#1378](https://github.com/fastapi/full-stack-fastapi-template/pull/1378) by [@tiangolo](https://github.com/tiangolo).
 * 💡 Remove unnecessary comment. PR [#1260](https://github.com/fastapi/full-stack-fastapi-template/pull/1260) by [@sebhani](https://github.com/sebhani).
 
+### Docs
+
+* 📝 Add MailCatcher to `development.md`. PR [#1387](https://github.com/fastapi/full-stack-fastapi-template/pull/1387) by [@tobiase](https://github.com/tobiase).
+
 ### Internal
 
 * 👷 Update `labeler.yml`. PR [#1388](https://github.com/fastapi/full-stack-fastapi-template/pull/1388) by [@tiangolo](https://github.com/tiangolo).