fix changelog links

Author: letmaik

CHANGELOG.md

@@ -150,6 +150,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Windows only, Python 3.5 - 3.8.
 - Support for [OBS-VirtualCam](https://github.com/CatxFish/obs-virtual-cam).
 
+[0.13.0]: https://github.com/letmaik/pyvirtualcam/compare/v0.12.1...v0.13.0
+[0.12.1]: https://github.com/letmaik/pyvirtualcam/compare/v0.12.0...v0.12.1
 [0.12.0]: https://github.com/letmaik/pyvirtualcam/compare/v0.11.1...v0.12.0
 [0.11.1]: https://github.com/letmaik/pyvirtualcam/compare/v0.11.0...v0.11.1
 [0.11.0]: https://github.com/letmaik/pyvirtualcam/compare/v0.10.2...v0.11.0