func (i Issue) IsAssignee(login string) bool {
	for _, assignee := range i.Assignees {
		if NormLogin(login) == NormLogin(assignee.Login) {
			return true
		}
	}
	return false
}
func (i Issue) IsAssignee(login string) bool {
	for _, assignee := range i.Assignees {
		if NormLogin(login) == NormLogin(assignee.Login) {
			return true
		}
	}
	return false
}
// IsAssignee checks if a user is assigned to the issue.