Update CHANGELOG.md

Author: reinink

CHANGELOG.md

@@ -32,6 +32,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `text-start` and `text-end` utilities ([#6656](https://github.com/tailwindlabs/tailwindcss/pull/6656))
 - Support customizing class name when using `darkMode: 'class'` ([#5800](https://github.com/tailwindlabs/tailwindcss/pull/5800))
 - Add `--poll` option to the CLI ([#7725](https://github.com/tailwindlabs/tailwindcss/pull/7725))
+- Add new `border-spacing` utilities ([#7102](https://github.com/tailwindlabs/tailwindcss/pull/7102))
 
 ## [3.0.23] - 2022-02-16