update changelog

docs/resources/changelog.md

@@ -10,6 +10,7 @@ _During the beta period, these restrictions may be relaxed in the event of a mis
 
 - 🚨 BREAKING: the `unit` property of `<sl-format-bytes>` has changed to `byte | bit` instead of `bytes | bits`
 - Added `display-label` part to `<sl-select>` [#650](https://github.com/shoelace-style/shoelace/issues/650)
+- Added `--spacing` CSS custom property to `<sl-divider>` [#664](https://github.com/shoelace-style/shoelace/pull/664)
 - Fixed a bug that caused `<sl-progress-ring>` to render the wrong size when `--track-width` was increased [#656](https://github.com/shoelace-style/shoelace/issues/656)
 - Fixed a bug that allowed `<sl-details>` to open and close when disabled using a screen reader [#658](https://github.com/shoelace-style/shoelace/issues/658)
 - Implemented stricter linting to improve consistency and reduce errors, which resulted in many small refactors throughout the codebase [#647](https://github.com/shoelace-style/shoelace/pull/647)