title: websockets not working work on python3.6.10?
body: <p>The piece of code below, works fine for python3.7 </p>
  
  <pre><code>import websockets
  import asyncio
  
  async with websockets.connect(url) as ws:
      res = await ws.recv()
  </code></pre>
  
  <p>but with python 3.6, i'm getting this error:</p>
  
  <pre><code>  File "&lt;stdin&gt;", line 1
      async with websockets.connect(url) as ws:
               ^
  SyntaxError: invalid syntax
  </code></pre>
  
  <p>Can some one explain the problem. Thanks.</p>