Include start date and end date in milestone changed notification email
So that user/customers on GitLab.com who care about GitLab CE/EE users can immediately see the dates without clicking through into GitLab itself.
- Start and due date: “Milestone changed to 11.8 (Jan 8 – Feb 22, 2019)”
- Only start date:
- Only due date:
- No dates: “Milestone changed to 11.8”