Make listener classes final package private

Author: benwoo1110

src/main/java/org/mvplugins/multiverse/netherportals/listeners/MVNPCoreListener.java

@@ -12,7 +12,7 @@
 import java.io.File;
 
 @Service
-public class MVNPCoreListener implements MVNPListener {
+final class MVNPCoreListener implements MVNPListener {
 
     private final MultiverseNetherPortals plugin;
 

src/main/java/org/mvplugins/multiverse/netherportals/listeners/MVNPEntityListener.java

@@ -35,7 +35,7 @@
 import java.util.Map;
 
 @Service
-public class MVNPEntityListener implements MVNPListener {
+final class MVNPEntityListener implements MVNPListener {
 
     private static final int COOLDOWN = 250;
 

src/main/java/org/mvplugins/multiverse/netherportals/listeners/MVNPPlayerListener.java

@@ -23,7 +23,7 @@
 import org.jvnet.hk2.annotations.Service;
 
 @Service
-public class MVNPPlayerListener implements MVNPListener {
+final class MVNPPlayerListener implements MVNPListener {
 
     private final MultiverseNetherPortals plugin;
     private final MVNameChecker nameChecker;

src/main/java/org/mvplugins/multiverse/netherportals/listeners/MVNPPluginListener.java

@@ -9,7 +9,7 @@
 import org.jvnet.hk2.annotations.Service;
 
 @Service
-public class MVNPPluginListener implements MVNPListener {
+final class MVNPPluginListener implements MVNPListener {
 
     private final MultiverseNetherPortals plugin;