chore(doc): update changelog for version 4.4.0 (#140)

Author: peknur

CHANGELOG.md

@@ -5,6 +5,8 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+## [4.4.0]
+
 ### Added
 - add support for Managed Load Balancer (beta)
 
@@ -125,7 +127,8 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 
 First stable release
 
-[Unreleased]: https://github.com/UpCloudLtd/upcloud-go-api/compare/v4.3.0...HEAD
+[Unreleased]: https://github.com/UpCloudLtd/upcloud-go-api/compare/v4.4.0...HEAD
+[4.4.0]: https://github.com/UpCloudLtd/upcloud-go-api/compare/v4.3.0...v4.4.0
 [4.3.0]: https://github.com/UpCloudLtd/upcloud-go-api/compare/v4.2.0...v4.3.0
 [4.2.0]: https://github.com/UpCloudLtd/upcloud-go-api/compare/v4.1.3...v4.2.0
 [4.1.3]: https://github.com/UpCloudLtd/upcloud-go-api/compare/v4.1.2...v4.1.3