fixed typo in unreleased section

Author: dlen

CHANGELOG.md

@@ -3,7 +3,7 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Unreleased](https://github.com/passbolt/passbolt_install_scripts/compare/v0.1.0...HEAD)
+## [Unreleased](https://github.com/passbolt/passbolt_install_scripts/compare/v0.2.1...HEAD)
 
 ## [0.2.1](https://github.com/passbolt/passbolt_install_scripts/compare/v0.2.1..v0.2.0) - 2018-11-14