Update changelog for KLogo updates.

CHANGELOG.md

@@ -4,6 +4,17 @@ Changelog is rather internal in nature. See release notes for the public overvie
 
 ## Version 4.x.x (`release-v4` branch)
 
+- [#561]
+  - **Description:** Update KLogo for new branding guidelines
+  - **Products impact:** Enables general use of KLogo for all frontend logo usage.
+  - **Addresses:** Updates logo to new logo, adds all permissible alternates, adds animated form.
+  - **Components:** KLogo
+  - **Breaking:** No
+  - **Impacts a11y:** No
+  - **Guidance:** Rendering the Kolibri logo can now be done using the KLogo component, as well as the loading animation.
+
+[#565]: https://github.com/learningequality/kolibri-design-system/pull/561
+
 - [#565]
   - **Description:** Revert adding engines
   - **Products impact:** Dependencies