Update changelog

CHANGELOG.md

@@ -5,15 +5,17 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 3.87.0 - 2026-10-17
+## Unreleased
 
 ### Added
 
-- Added a _Storybook_ story for the investment chart component
+- Added a tool to update the cash balance of an account to the server of the Model Context Protocol (MCP) (experimental)
+
+## 3.87.0 - 2026-10-17
 
 ### Added
 
-- Added a tool to update the cash balance of an account to the server of the Model Context Protocol (MCP) (experimental)
+- Added a _Storybook_ story for the investment chart component
 
 ### Changed