Increase version to 0.4.0
Increase version to 0.4.0

Change-Id: Iac66a1b5d9887522b8e9e9242766e49e8844193b

deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor