Add a special rule for Sulfuras quality

php7/src/GildedRose.php

@@ -12,6 +12,12 @@ final class GildedRose {
 
     public function updateQuality() {
         foreach ($this->items as $item) {
+            if ($item->name === 'Sulfuras, Hand of Ragnaros') {
+                $item->quality = 80;
+
+                continue;
+            }
+
             if ($item->name != 'Aged Brie' and $item->name != 'Backstage passes to a TAFKAL80ETC concert') {
                 if ($item->quality > 0) {
                     if ($item->name != 'Sulfuras, Hand of Ragnaros') {