updte changelog

Author: haschek

CHANGELOG.md

@@ -63,6 +63,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
     -   do not create empty list items
 -   `<CodeEditor />`
     -   re-render the component if the `wrapLines` property is changed after the component's render
+    -   only fire `onChange` event when the document has actually changed
 -   `<SearchField />`
     -   allow to use `onClearanceHandler` and `rightElement` together
     -   fix display of `Icon` with `tooltipText` as direct child in `rightElement`