Update CHANGELOG.md

Co-authored-by: Jeppe Kuhlmann Andersen <78410897+jekuaitk@users.noreply.github.com>

Author: rimi-itk

CHANGELOG.md

@@ -8,7 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
-* [PR-19](https://github.com/itk-dev/os2forms_nemlogin_openid_connect/pull/19)
+* [PR-20](https://github.com/itk-dev/os2forms_nemlogin_openid_connect/pull/20)
   Added support for Key
 
 ## [2.0.1] 2024-03-07