Update JDA to v5.0.

pom.xml

@@ -35,7 +35,7 @@
         <dependency>
             <groupId>net.dv8tion</groupId>
             <artifactId>JDA</artifactId>
-            <version>5.0.0-beta.5</version>
+            <version>5.0.0-beta.6</version>
         </dependency>
         <dependency>
             <groupId>commons-io</groupId>

src/main/java/moe/nekojimi/chords/Chords.java

@@ -28,9 +28,9 @@ import net.dv8tion.jda.api.JDA;
 import net.dv8tion.jda.api.JDABuilder;
 import net.dv8tion.jda.api.entities.*;
 import net.dv8tion.jda.api.entities.channel.middleman.AudioChannel;
-import net.dv8tion.jda.api.entities.channel.unions.AudioChannelUnion;
 import net.dv8tion.jda.api.events.guild.voice.GuildVoiceUpdateEvent;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
 import net.dv8tion.jda.api.managers.AudioManager;
 import net.dv8tion.jda.api.requests.GatewayIntent;
@@ -103,6 +103,7 @@ public final class Chords extends ListenerAdapter
         builder.setCompression(Compression.NONE);
         // Set activity (like "playing Something")
         builder.setActivity(Activity.playing("music!"));
+        builder.enableIntents(GatewayIntent.MESSAGE_CONTENT);
 
         final Chords listener = new Chords();
 
@@ -187,13 +188,13 @@ public final class Chords extends ListenerAdapter
         if (this.currentVoiceChannel == null)
             return;
 
-        final AudioChannelUnion channelLeft = event.getChannelLeft();
+        final AudioChannel channelLeft = event.getChannelLeft();
-
+        if (channelLeft != null && channelLeft == currentVoiceChannel)
+        {
             if (channelLeft.getMembers().isEmpty())
-            if (channelLeft == currentVoiceChannel)
                 disconnect();
         }
-
+    }
     @Override
     public void onMessageReceived(MessageReceivedEvent event)
     {

src/main/java/moe/nekojimi/chords/commands/Invocation.java

@@ -19,7 +19,6 @@ package moe.nekojimi.chords.commands;
 import java.util.List;
 import net.dv8tion.jda.api.entities.Message;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
-import net.dv8tion.jda.api.requests.FluentRestAction;
 import net.dv8tion.jda.api.requests.restaction.MessageCreateAction;
 
 /**
@@ -54,17 +53,14 @@ public class Invocation
     @SuppressWarnings("null")
     public void respond(String text)
     {
-        FluentRestAction<Message, ?> action = null;
 
         if (responseMessage == null)
         {
-            action = requestMessage.reply(text);
+            responseMessage = requestMessage.reply(text).complete();
         } else
         {
-            action = responseMessage.editMessage(text);
+            responseMessage = responseMessage.editMessage(text).complete();
         }
-
-        responseMessage = action.complete();
     }
 
     public Message getRequestMessage()