Fixed capitalization in event files

src/main/java/com/alttd/proxydiscordlink/events/PlayerJoin.java

@@ -14,7 +14,7 @@ import net.luckperms.api.model.user.User;
 import net.luckperms.api.node.Node;
 import net.luckperms.api.node.types.InheritanceNode;
 
-public class playerJoin {
+public class PlayerJoin {
 
     @Subscribe(order = PostOrder.LATE)
     public void onPlayerJoin(ServerConnectedEvent event) {

src/main/java/com/alttd/proxydiscordlink/events/PlayerLeave.java

@@ -7,7 +7,7 @@ import com.velocitypowered.api.event.Subscribe;
 import com.velocitypowered.api.event.connection.DisconnectEvent;
 import com.velocitypowered.api.proxy.Player;
 
-public class playerLeave {
+public class PlayerLeave {
 
     @Subscribe(order = PostOrder.LATE)
     public void onPlayerLeave(DisconnectEvent event) {