CHANGELOG: fix diff link to appropriately use the v5.0.0 tag

Author: sivaraam

CHANGELOG.md

@@ -69,7 +69,7 @@
   ensuring only the selected picture is removed as expected.
 
 What's listed here is only a subset of all the changes. Check the full-list of
-the changes in [this link](https://github.com/commons-app/apps-android-commons/compare/v4.2.1...v4.3.0).
+the changes in [this link](https://github.com/commons-app/apps-android-commons/compare/v4.2.1...v5.0.0).
 Alternatively, checkout this release on GitHub releases page for an exhaustive
 list of changes and the various contributors who contributed the same.