Quick cleanup

src/main/java/com/drtshock/playervaults/commands/ConvertCommand.java

@@ -17,8 +17,8 @@ import java.util.*;
 
 public class ConvertCommand implements CommandExecutor {
 
-    private List<Converter> converters = new ArrayList<>();
-    private ServiceProvider uuidProvider;
+    private final List<Converter> converters = new ArrayList<>();
+    private final ServiceProvider uuidProvider;
 
     public ConvertCommand() {
         converters.add(new BackpackConverter());

src/main/java/com/drtshock/playervaults/commands/SignSetInfo.java

@@ -23,7 +23,7 @@ package com.drtshock.playervaults.commands;
 public class SignSetInfo {
 
     private String owner;
-    private int number;
+    private final int number;
     private boolean self = false;
 
     /**