update changelog

docs/resources/changelog.md

@@ -37,6 +37,7 @@ This change applies to all design tokens that implement a color. Refer to the [c
 - Added new color primitives to the base set of design tokens
 - Added `--sl-color-*-950` swatches to all color palettes
 - Added a console error that appears when menu items have duplicate values in `sl-select`
+- Added CodePen link to code examples
 - Exposed base and dark stylesheets so they can be imported via JavaScript [#438](https://github.com/shoelace-style/shoelace/issues/438)
 - Fixed a bug in `sl-menu` where pressing <kbd>Enter</kbd> after using type to select would result in the wrong value
 - Refactored thumb position logic in `sl-switch` [#490](https://github.com/shoelace-style/shoelace/pull/490)