title: pytube-Youtube function not initializing
body: <p>I have <code>pytube</code> installed, i am getting an error when i run it(I am using python 3.7), the problem seems to be with the <code>pytube</code> itself ,i am using exact code of tutorials for this module.  </p>
  
  <pre><code>import pytube
  
  link ='https://www.youtube.com/watch?v=9bZkp7q19f0'
  yt = pytube.YouTube(link)
  stream = yt.streams.first()
  finished = stream.download()
  print('Download is complete')
  
  
  Traceback (most recent call last):
    File "C:\automate the boring stuff\youtubetry.py", line 6, in &lt;module&gt;
      yt = pytube.YouTube(link)
    File "C:\Users\diodi\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pytube\__main__.py", line 88, in __init__
      self.prefetch_init()
  
  
  [Finished in 6.0s with exit code 1]
  </code></pre>