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
 
 ## Next
 
+- Changed the type of component styles from `CSSResult` to `CSSResultGroup` [#828](https://github.com/shoelace-style/shoelace/issues/828)
 - Updated Bootstrap Icons to 1.9.1
 
 ## 2.0.0-beta.78