Return the completed issues for the sprint.

def removed_issues(self, board_id, sprint_id):
        """Return the completed issues for the sprint."""
        r_json = self._get_json('rapid/charts/sprintreport?rapidViewId=%s&sprintId=%s' % (board_id, sprint_id),
                                base=self.AGILE_BASE_URL)
        issues = [Issue(self._options, self._session, raw_issues_json) for raw_issues_json in
                  r_json['contents']['puntedIssues']]

        return issues