Add changerlog

Author: sequba

CHANGELOG.md

@@ -7,6 +7,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Fixed
+
+- Fix an issue where overwriting a non-computed cell caused the `Value of the formula cell is not computed` error. [#1194](https://github.com/handsontable/hyperformula/issues/1194)
+
 ## [3.1.0] - 2025-10-14
 
 ### Changed