title: discord.py, sending a message in all channels with a webhook
body: <p>I wanted to make a command for my private server, that creates webhooks in all guild's channels and makes them send a message, I already tried to make it like this:</p>
  <pre><code>@client.command()
  async def allchannel(ctx):
    for channel in ctx.guild.channels:
      webhook = discord.utils.get(await ctx.channel.webhooks())
      if not webhook:
        webhook = await ctx.channel.create_webhook(&quot;Test&quot;)
        await webhook.send(content=&quot;Hello&quot;)
  </code></pre>
  <p>But it says: discord.ext.commands.errors.CommandInvokeError: Command raised an exception: TypeError: create_webhook() takes 1 positional argument but 2 were given</p>