Entity 320 (CNS) missing from entity_level_30 specs

> nordcancore::nordcan_metadata_column_specifications("entity_level_30")
$format
[1] "Categorical"

$levels
 [1]  10  20  40  30 150  41  50  60  70  80  90 100 410 110 120 130 420 140 160 170 340 290 300 350 180 227 228 190 200 210 220 229 260 240 250 270 280 310  NA 330 434 438 455 435 437 431 439 444 440
[50] 442 443 436 441 445 456 448 446 451 452 454 450 449 999 453

CancerRegistryOfNorway / nordcancore

Entity 320 (CNS) missing from entity_level_30 specs #3