Change some minor things to Nicknames

galaxy/src/main/java/com/alttd/chat/nicknames/NicknamesEvents.java

@@ -20,6 +20,7 @@ import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.plugin.messaging.PluginMessageListener;
 import org.bukkit.scheduler.BukkitRunnable;
+import org.jetbrains.annotations.NotNull;
 
 import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
@@ -82,7 +83,7 @@ public class NicknamesEvents implements Listener, PluginMessageListener {
     }
 
     @Override
-    public void onPluginMessageReceived(String channel, Player player, byte[] message) {
+    public void onPluginMessageReceived(String channel, @NotNull Player player, byte[] message) {
         if (!channel.equals(Config.MESSAGECHANNEL)) {
             return;
         }