Update placeable.json

Author: TheNuclearNexus

smithed_libraries/packs/custom-block/data/smithed.custom_block/tags/blocks/placeable.json

@@ -7,6 +7,7 @@
         "minecraft:dispenser",
         "minecraft:dropper",
         "minecraft:campfire",
-        "minecraft:soul_campfire"
+        "minecraft:soul_campfire",
+        "minecraft:hopper"
     ]
-}
+}