title: Discord.py - client.send_message() doesn't send message - Python 3.6
body: <pre><code>client = discord.Client()
  noticeme = 'notice me senpai'
  
  @bot.event
  async def on_message(message):
      author = message.author
      authorid = message.author.id
      print ("@{} user sent a message. (id: {})".format(author, authorid))
  
      if message.content == noticeme:
          print ('I noticed you @{}!'.format(authorid))
          await client.send_message(message.channel, 'I noticed you @{}!'.format(authorid))
  </code></pre>
  
  <p>I'm trying to make a command that responds with "I noticed you @username!" when you say "notice me senpai" but it doesn't work. (the print DOES work)</p>