Author: Sara Arjona
MDL-61957 gradereport_history: Implement privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=01dd8aff462e41d258a0f523875d2c371feecf38
http://github.com/moodle/moodle/commit/01dd8aff462e41d258a0f523875d2c371feecf38
+ 3.3 en [privacy:metadata,gradereport_history]