update changelog

Changelog.md

@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.26] - 2023-08-09
+- Add toast messages when saving survey progress
+- Changed application of styles to the survey through survey.css instead of manually applying classes
+- Changed validation buttons to be added both on rerender and after a value has changed.
+- Added back coloring of the question headers if there is a validation error
+
 ## [0.25] - 2023-08-07
 - Update user management to work correctly, and update immediately on changes instead of an edit mode
 - Removed duplicate modules in survey bundle