Fix CHANGELOG

Author: AlexanderWells-diamond

CHANGELOG.rst

@@ -165,7 +165,8 @@ Added:
 Last release as an EPICS module rather than a Python package
 
 
-.. _Unreleased: https://github.com/dls-controls/pythonIoc/compare/4.1.0...HEAD
+.. _Unreleased: https://github.com/dls-controls/pythonIoc/compare/4.2.0...HEAD
+.. _4.2.0: https://github.com/dls-controls/pythonIoc/compare/4.1....4.2.0
 .. _4.1.0: https://github.com/dls-controls/pythonIoc/compare/4.0.2...4.1.0
 .. _4.0.2: https://github.com/dls-controls/pythonIoc/compare/4.0.1...4.0.2
 .. _4.0.1: https://github.com/dls-controls/pythonIoc/compare/3.2.1...4.0.1