Update CHANGELOG-VAADIN8.md

CHANGELOG-VAADIN8.md

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 # Vaadin 8 extended maintenance version changelog
 
+## Vaadin 8.18.0
+
+* Fixed issue #12560 by improving Grid's horizontal scrolling scrolling logic.
+* Fixed an issue in Combobox where scrolling to selection would fail if the user had typed into the input field. Possibly related to #12562.
+* Added `runAfterRoundTrip` API to the UI class for improved sequence control, allowing execution of a callback after one or more client-server round trips have been completed.
+* Separated portlet support code out of `vaadin-server` into its own package, `vaadin-portlet`. **This will break your build** if your application makes use of Portlet classes.
+* Added support for Vaadin Multiplatform Runtime version 24+ by adding packages `vaadin-server-mpr-jakarta` and `vaadin-compatibility-server-mpr-jakarta`
+
 ## Vaadin 8.17.0
 
 * Improved hierarchical data container handling, resulting in increased speed and correcting some potential memory leaks.