avatar.js

 if (comando === "avatar") {
      let usuario = message.mentions.members.first() || message.member;
      let embed = new Discord.RichEmbed()
      embed.setColor("RANDOM")
      embed.setDescription(`Avatar do usuário ${usuario.user.username}`)
      embed.setImage(usuario.user.displayAvatarURL)
      message.channel.send(embed)
   }