title: getting the discord.py bot to echo a message and then remove it
body: <p>basically I want to make a bot that copy a message with a specific command and then remove the original message and keep its own. 
  this is the code I used</p>
  
  <pre><code>if message.content.startswith("!echo"):
              await message.channel.send(message.content[5:].format(message))
              await client.delete_message(context.message) 
  </code></pre>
  
  <p>so far the echoing works good but the original message doesn't get removed</p>