Added new biome enum values

By: Nathan Adams <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/block/Biome.java

@@ -20,4 +20,10 @@ public enum Biome {
     OCEAN,
     RIVER,
     EXTREME_HILLS,
+    FROZEN_OCEAN,
+    FROZEN_RIVER,
+    ICE_PLAINS,
+    ICE_MOUNTAINS,
+    MUSHROOM_ISLAND,
+    MUSHROOM_SHORE
 }