Update UNRELEASED.md

Author: Brendan Boyle

polaris-react/UNRELEASED.md

@@ -11,6 +11,7 @@ Use [the changelog guidelines](/documentation/Versioning%20and%20changelog.md) t
 - Added `useCapture` and `options` props in `KeypressListener` to allow passing through those options to the underlying `addEventListener` call ([#5221](https://github.com/Shopify/polaris-react/pull/5221))
 - Add option to make `Thumbnail` component transparent ([#5109](https://github.com/Shopify/polaris-react/pull/5109))
 - Replaced hardcoded transition values with tokens ([5340](https://github.com/Shopify/polaris/pull/5340/))
+- Added zebra striping and visual density updates to DataTable ([5365](https://github.com/Shopify/polaris/pull/5365))
 
 ### Bug fixes