fix: check if the channel is really empty

Closes #7

package.json

@@ -1,6 +1,6 @@
 {
   "name": "discord-player",
-  "version": "1.3.7",
+  "version": "1.3.8",
   "description": "Complete framework to facilitate music commands using discord.js v12",
   "main": "index.js",
   "scripts": {

src/Player.js

@@ -66,6 +66,8 @@ class Player {
             // Search for a queue for this channel
             let queue = this.queues.find((g) => g.connection.channel.id === oldState.channelID);
             if(queue){
+                // If the channel is not empty
+                if(queue.connection.channel.members.size > 1) return;
                 // Disconnect from the voice channel
                 queue.connection.channel.leave();
                 // Delete the queue