Update CHANGELOG.md

Author: githubsaturn

CHANGELOG.md

@@ -5,6 +5,7 @@
 -   Improved: Enabling gzip for the dashboard for a faster load
 -   Improved: Allowing custom captain domain for webhooks [PR-1330](https://github.com/caprover/caprover/pull/1330)
 -   Improved: Update Netdata [PR-1432](https://github.com/caprover/caprover/pull/1432)
+-   Improved: Adding support for overwriting app defaults NGINX config [PR-1377](https://github.com/caprover/caprover/pull/1377)
 -   Fixed: Allowing dots to be present in repo names [PR-1553](https://github.com/caprover/caprover/pull/1553)