title: Pycord message.content is empty
body: <p>I'm playing around with the Discord API and noticed that I can't access the content of a message.</p>
  <p>This is my code:</p>
  <pre><code>import discord
  
  client = discord.Client()
  
  @client.event
  async def on_ready():
      print(f'Logged in as {client.user}')
  
  @client.event
  async def on_message(message):
      if 'My Name' in message.author.name:
          print(f'Author: {message.author.name}')
          print(f'Content: {message.content}')
          print(f'Clean_Content: {message.clean_content}')
          print(f'System_Content: {message.system_content}')
  
  client.run(TOKEN, bot=False)
  </code></pre>
  <p><em>Note that the token and my username are kept private in this post for obvious reasons.</em></p>
  <p>This is the output that I get, no matter the message:</p>
  <pre><code>Author: My Name
  Content: 
  Clean_Content: 
  System_Content: 
  </code></pre>
  <p>As you can see I have also tried the clean_content and system_content attributes. However, none of them show the actual message. I've also tried to use a bot account and that surprisingly worked, but I want this to work with my own account. Is the problem that Discord does not intent private clients to read messages or did I miss something fundamental?</p>