Fix PacketAdapter security

Author: Rothes

src/main/java/me/rothes/protocolstringreplacer/packetlisteners/AbstractPacketListener.java

@@ -15,7 +15,7 @@
 public abstract class AbstractPacketListener {
 
     protected final PacketType packetType;
-    public PacketAdapter packetAdapter;
+    protected PacketAdapter packetAdapter;
 
     protected AbstractPacketListener(@Nonnull PacketType packetType) {
         this.packetType = packetType;