Updated changelog for new release
# Unreleased
+--
+
+# 4.0.0
+
+## Changed
- Official docker image moved to [Docker Hub](https://hub.docker.com/repository/docker/hellofreshtech/janus) and can be pulled with `docker pull hellofreshtech/janus`
- Test and release flow uses the latest stable Go version
---
-
# 3.8.19
## Added
