Add 1.15.2 backward compatibility.

Update to 1.14 api.

pom.xml

@@ -46,7 +46,7 @@
         <java.version>1.8</java.version>
         <!-- More visible way how to change dependency versions -->
         <spigot.version>1.16.1-R0.1-SNAPSHOT</spigot.version>
-        <bentobox.version>1.14.0-SNAPSHOT</bentobox.version>
+        <bentobox.version>1.14.0</bentobox.version>
         <!-- Revision variable removes warning about dynamic version -->
         <revision>${build.version}-SNAPSHOT</revision>
         <!-- This allows to change between versions and snapshots. -->

src/main/java/world/bentobox/caveblock/Settings.java

@@ -1,6 +1,7 @@
 package world.bentobox.caveblock;
 
 
+import com.google.common.base.Enums;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -2055,7 +2056,7 @@ public class Settings implements WorldSettings
 
     @ConfigComment("The default biome for the nether world (this may affect what mobs can spawn)")
     @ConfigEntry(path = "world.nether.biome", since = "1.14.0")
-    private Biome defaultNetherBiome = Biome.NETHER_WASTES;
+    private Biome defaultNetherBiome = Enums.getIfPresent(Biome.class, "NETHER").or(Enums.getIfPresent(Biome.class, "NETHER_WASTES").or(Biome.BADLANDS));
 
     @ConfigComment("Nether spawn protection radius - this is the distance around the nether spawn")
     @ConfigComment("that will be protected from player interaction (breaking blocks, pouring lava etc.)")

src/main/resources/config.yml

@@ -194,7 +194,6 @@ world:
   remove-mobs-whitelist:
     - WITHER
     - ENDERMAN
-    - ZOMBIFIED_PIGLIN
     - ZOMBIE_VILLAGER
   # World flags. These are boolean settings for various flags for this world
   flags: