Release 0.4.0: Update change log (#3468)
Release 0.4.0: Update change log (#3468)

* Updated component images to version eb69a6b8ae2d82cd8574ed11f04af4607756061c

* Updated components to version 0e794e8a0eff6f81ddc857946ee8311c7c431ec2

* update version number

* update change log
kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines