add changelog entry

Author: labrenbe

rust/stackablectl/CHANGELOG.md

@@ -10,6 +10,7 @@ All notable changes to this project will be documented in this file.
 
 - Add shell completions for Nushell and Elvish ([#337]).
 - SOCKS5 and HTTP proxy support ([#328]).
+- Add new argument `--release` that allows installing a specific version of a demo or stack ([#340]).
 
 ### Fixed
 
@@ -18,6 +19,7 @@ All notable changes to this project will be documented in this file.
 [#328]: https://github.com/stackabletech/stackable-cockpit/pull/328
 [#336]: https://github.com/stackabletech/stackable-cockpit/pull/336
 [#337]: https://github.com/stackabletech/stackable-cockpit/pull/337
+[#340]: https://github.com/stackabletech/stackable-cockpit/pull/340
 
 ## [24.11.0] - 2024-11-18