Fixed typo

Author: GrahamCampbell

CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * Work around GitLab's API returning bad JSON for some endpoints
 
-[10.3.0]: https://github.com/GitLabPHP/Client/compare/10.3.0...10.3.1
+[10.3.1]: https://github.com/GitLabPHP/Client/compare/10.3.0...10.3.1
 
 ## [10.3.0] - 2020-11-27