update changelog

Author: philippotto

CHANGELOG.unreleased.md

@@ -13,6 +13,7 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.released
 ### Added
 - Added the total volume of a dataset to a tooltip in the dataset info tab. [#8229](https://github.com/scalableminds/webknossos/pull/8229)
 - Optimized performance of data loading with “fill value“ chunks. [#8271](https://github.com/scalableminds/webknossos/pull/8271)
+- The fill tool can now be adapted so that it only acts within a specified bounding box. Use the new "Restrict Floodfill" mode for that in the toolbar. [#8267](https://github.com/scalableminds/webknossos/pull/8267)
 
 ### Changed
 - Renamed "resolution" to "magnification" in more places within the codebase, including local variables. [#8168](https://github.com/scalableminds/webknossos/pull/8168)