Fix typo

CHANGELOG.md

@@ -4,9 +4,9 @@ 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).
 
-## [Unreleased](https://github.com/soundasleep/html2text_ruby/compare/0.4.0...master)
+## [Unreleased](https://github.com/soundasleep/html2text_ruby/compare/v0.4.0...master)
 
-## [0.4.0](https://github.com/soundasleep/html2text_ruby/compare/0.3.1...0.4.0) - 2024-06-08
+## [0.4.0](https://github.com/soundasleep/html2text_ruby/compare/0.3.1...v0.4.0) - 2024-06-08
 ### Added
 - Switch from Travis to Github Actions for Build and Test
 - Add rubocop for linting and cleanup existing violations ([#36](https://github.com/soundasleep/html2text_ruby/pull/36))