Update README

README.md

@@ -35,6 +35,7 @@ When a monitor disconnects, its workspaces will move to another monitor, but upo
     - You can [block out](https://github.com/YaLTeR/niri/wiki/Configuration:-Window-Rules#block-out-from) sensitive windows from screencasts
 - [Touchpad](https://github.com/YaLTeR/niri/assets/1794388/946a910e-9bec-4cd1-a923-4a9421707515) and [mouse](https://github.com/YaLTeR/niri/assets/1794388/8464e65d-4bf2-44fa-8c8e-5883355bd000) gestures
 - Configurable layout: gaps, borders, struts, window sizes
+- [Gradient borders](https://github.com/YaLTeR/niri/wiki/Configuration:-Layout#gradients) with Oklab and Oklch support
 - [Animations](https://github.com/YaLTeR/niri/assets/1794388/ce178da2-af9e-4c51-876f-8709c241d95e) with support for [custom shaders](https://github.com/YaLTeR/niri/assets/1794388/27a238d6-0a22-4692-b794-30dc7a626fad)
 - Live-reloading config