title: Finding author of a message
body: <p>If someone writes "?name (arg)" I want my bot to say the author of the message + ", your name is" + arg. <strong>I can't find of the author of the message</strong> though.</p>
  
  <pre><code>@client.command()
  async def name(their_name):
      await client.say("{0}, your name is {1}.".format("""author of the message goes here""", their_name))
  </code></pre>