v1.5.0: Redmine 2.x and 3.x simultaneous support
- Backwards-compatibility to Redmine 2.2 by testing if issue.closed_on? method exists (#49)
- Better documentation of plugin permissions
- Reversible migrations so can uninstall fully (#53)
- Highlighting to user that adding recurrence via issues page is the best way (#52)
- Stable support for both Redmine 2.x and Redmine 3.x (#71); (#67) and (#69)