server banner

client.on("message", message => {
  if(message.content.startsWith(prefix + "banner")) {
    if(message.guild.bannerURL === null || message.guild.bannerURL === undefined) return message.channel.send("**? | This server doesn\'t have a banner.**");
    const ba = new Discord.RichEmbed()
    .setAuthor(message.guild.name, message.guild.iconURL)
    .setDescription(`[Banner URL](${message.guild.bannerURL}?size=2048)`)
    .setImage(message.guild.bannerURL + "?size=2048")
    message.channel.send({embed : ba})
  }
});