- used Issue constructor instead of CreateNewIssue method, for creating new issue;
- updated methods in SprintReport: GetRecentlyCompletedTasks will get tasks from yesterday to today, and GetOldCompletedTasks will get tasks from one week before yesterday;
- moved methods from SprintReport class to TimeFormatting and changed their name to GetCompletedTime and SetTimeSpan;
- updated DateToISO method;
- updated template.