title: how to do roles logging in discord.py?
body: <p>I want to do role logging in discord.py, example:</p>
  <pre><code>@bot.event
  async def on_member_update(before, after)
   await channel.send(after.role)
  </code></pre>
  <p>so it will send the after role(the new role), but after doesn't have <code>after.role</code> that will return the new role
  so how do i get the new role name and id?</p>