title: (discord.py) change discord avatar with someone's avatar url
body: <p>I'm trying to change my bot's avatar with the avatar url of someone in my server. The code isn't working. Any help?</p>
  <pre><code>@bot.event
  async def on_ready():
          avatar_url=&quot;https://cdn.discordapp.com/avatars/834942728953135115/315376d20a50a86450e9e3b91ff66123.webp?size=1024&quot; #avatar url of someone in my server
          await bot.user.edit(avatar=avatar_url)
  </code></pre>