fixing CHANGELOG.md

CHANGELOG.md

@@ -25,6 +25,16 @@ Changelog is rather internal in nature. See release notes for the public overvie
  [#688] https://github.com/learningequality/kolibri-design-system/pull/688
 
 
+[#728]
+  - **Description:** Add $darken_ Utility Functions for Darkening Palette Colors 
+  - **Products impact:**  
+  - **Addresses:** [#726](https://github.com/learningequality/kolibri-design-system/issues/726)
+  - **Components:** `KCard`
+  - **Breaking:** No
+  - **Impacts a11y:**  No
+  - **Guidance:**
+ [#728] https://github.com/learningequality/kolibri-design-system/pull/728
+
 [#707]
   - **Description:** Card Validations
   - **Products impact:**