Add blackstone to mining XP

src/main/resources/experience.yml

@@ -367,6 +367,7 @@ Experience_Values:
         Lily_Of_The_Valley: 150
         Wither_Rose: 500
     Mining:
+        Blackstone: 55
         Warped_Nylium: 5
         Crimson_Nylium: 5
         Ancient_Debris: 7777