Add material class for Gates. (SPIGOT-192)

By: FearThe1337 <admin@fearthe1337.com>

paper-api/src/main/java/org/bukkit/Material.java

@@ -248,11 +248,11 @@ public enum Material {
     RED_SANDSTONE_STAIRS(180, Stairs.class),
     DOUBLE_STONE_SLAB2(181),
     STONE_SLAB2(182),
-    SPRUCE_FENCE_GATE(183),
-    BIRCH_FENCE_GATE(184),
-    JUNGLE_FENCE_GATE(185),
-    DARK_OAK_FENCE_GATE(186),
-    ACACIA_FENCE_GATE(187),
+    SPRUCE_FENCE_GATE(183, Gate.class),
+    BIRCH_FENCE_GATE(184, Gate.class),
+    JUNGLE_FENCE_GATE(185, Gate.class),
+    DARK_OAK_FENCE_GATE(186, Gate.class),
+    ACACIA_FENCE_GATE(187, Gate.class),
     SPRUCE_FENCE(188),
     BIRCH_FENCE(189),
     JUNGLE_FENCE(190),