Require MOVE_MEMBERS for voice commands

commands/util-voice/leave.js

@@ -20,6 +20,9 @@ module.exports = class LeaveCommand extends Command {
 			const usage = this.client.registry.commands.get('stop').usage();
 			return msg.reply(`I am currently playing audio in this server. Please use ${usage} first.`);
 		}
+		if (!connection.channel.permissionsFor(msg.author).has('MOVE_MEMBERS')) {
+			return msg.reply(`You need the "MOVE_MEMBERS" permission to use the \`${this.name}\` command.`);
+		}
 		connection.leave();
 		return msg.reply(`Left **${connection.channel.name}**...`);
 	}