[APOLLO-2953] - Added completed date to domain model
[APOLLO-2953] - added condition in exchange Array
[APOLLO-2953] - added condition for test ing exchange Array
[APOLLO-2953] - added test to improve coverage
Merge pull request #70 from ministryofjustice/APOLLO-2953-Completed-Date

[APOLLO-2953] - Added completed date to domain model