Add v0.9.8 to changelog

Author: acelaya

CHANGELOG.md

@@ -4,7 +4,7 @@ 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).
 
-## [Unreleased]
+## [0.9.8] - 2025-06-06
 ### Added
 * Add tailwind-based `Tooltip` component.
 * Forward refs to `Button`, `LinkButton` and `CloseButton` tailwind-based components.