title: Pytube Error: AttributeError: 'module' object has no attribute 'Client'
body: <p>I've been trying to use the Pytube module and every time I use its Client attribute it keeps coming up with the following error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "&lt;pyshell#3&gt;", line 1, in &lt;module&gt;
      client = pytube.Client('my-app-identifier')
  AttributeError: 'module' object has no attribute 'Client'
  </code></pre>