Added v4.0.0 into CHANGELOG.md

Author: vyskocilpavel

CHANGELOG.md

@@ -153,6 +153,7 @@ All notable changes to this project will be documented in this file.
 - Changelog
 
 [Unreleased]: https://github.com/CESNET/proxystatistics-simplesamlphp-module/tree/master
+[v4.0.0]: https://github.com/CESNET/proxystatistics-simplesamlphp-module/tree/v4.0.0
 [v3.2.1]: https://github.com/CESNET/proxystatistics-simplesamlphp-module/tree/v3.2.1
 [v3.2.0]: https://github.com/CESNET/proxystatistics-simplesamlphp-module/tree/v3.2.0
 [v3.1.0]: https://github.com/CESNET/proxystatistics-simplesamlphp-module/tree/v3.1.0