DOC: update change log

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Optional WYSIWYG editor with markdown output for text properties. Controled by
   the `BUILD_MODULE_EXT_EDITMODE_WYSIWYG_TEXT` build variable which is set do
   `DISABLED` by default.
+  - Added button to version history panel that allows restoring old versions
 
 ### Changed (for changes in existing functionality)
 
@@ -35,6 +36,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `src/ext/html/` and link to that.
 
 ### Fixed (for any bug fixes)
+- #156
+- #251
 
 ### Security (in case of vulnerabilities)