title: my avatar command doesn't support gif format on discord.js v12
body: <pre><code>let embed = new Discord.MessageEmbed()
          .setColor("#985ce7")
          .setAuthor(message.author.tag, message.author.displayAvatarURL())
          .setDescription(`[Avatar URL Link](${message.author.displayAvatarURL()})`)
          .setImage(message.author.displayAvatarURL())
  
          message.channel.send(embed)
  </code></pre>
  
  <p>if the command used by the avatar user in gif format, then the result is not in gif format.</p>
  
  <p>but, I try as below</p>
  
  <pre><code>let embed = new Discord.MessageEmbed()
          .setColor("#985ce7")
          .setAuthor(message.author.tag, message.author.displayAvatarURL())
          .setDescription(`[Avatar URL Link](${message.author.displayAvatarURL()})`)
          .setImage(message.author.displayAvatarURL({format : "gif"}))
           message.channel.send(embed)
  </code></pre>
  
  <p>if the command used by the avatar user in png format, then the results do not appear pictures.</p>
  
  <p>Thanks before!</p>