title: delete user messages in discord-rewrite.py
body: <p>What this command is supposed to do is delete the specified number of messages, but instead I get an error:</p>
  
  <pre><code>Ignoring exception in command clear:
  Traceback (most recent call last):
    File "C:\Users\dimit\AppData\Local\Programs\Python\Python36\lib\site-packages\discord\ext\commands\core.py", line 62, in wrapped
      ret = yield from coro(*args, **kwargs)
    File "c:/Users/dimit/Desktop/Discord Bot Shit/BasicBot.py", line 54, in clear
      await channel.purge(messages)
  TypeError: purge() takes 1 positional argument but 2 were given
  
  The above exception was the direct cause of the following exception:
  
  Traceback (most recent call last):
    File "C:\Users\dimit\AppData\Local\Programs\Python\Python36\lib\site-packages\discord\ext\commands\bot.py", line 886, in invoke
      yield from ctx.command.invoke(ctx)
    File "C:\Users\dimit\AppData\Local\Programs\Python\Python36\lib\site-packages\discord\ext\commands\core.py", line 498, in invoke
      yield from injected(*ctx.args, **ctx.kwargs)
    File "C:\Users\dimit\AppData\Local\Programs\Python\Python36\lib\site-packages\discord\ext\commands\core.py", line 71, in wrapped
      raise CommandInvokeError(e) from e
  discord.ext.commands.errors.CommandInvokeError: Command raised an exception: TypeError: purge() takes 1 positional argument but 2 were given
  </code></pre>
  
  <p>The code I have tried:</p>
  
  <pre><code>@bot.command()
  async def clear(ctx,amount):
      channel = ctx.message.channel
      messages = []
      async for message in channel.history(limit=int(amount)):
          messages.append(message)
          await channel.purge(messages)
  </code></pre>