update releases.md

Author: raphamorim

docs/docs/releases.md

@@ -10,6 +10,7 @@ language: 'en'
 
 ## 0.2.3 (unreleased)
 
+- Fixed Nix build [#853](https://github.com/raphamorim/rio/pull/853).
 - On macOS, fixed undocumented cursors (e.g. zoom, resize, help) always appearing to be invalid and falling back to the default cursor.
 - On X11, Wayland, Windows and macOS, improved scancode conversions for more obscure key codes.
 	- On macOS, fixed the scancode conversion for audio volume keys.