title: dateutil 2.5.0 is the minimum required version
body: <p>I'm running the jupyter notebook (Enthought Canopy python distribution 2.7) on Mac OSX (v 10.13.6).  When I try to import pandas (import pandas as pd), I am getting the complaint: ImportError: dateutil 2.5.0 is the minimum required version. I have these package versions:</p>
  
  <ul>
  <li>Canopy version 2.1.3.3542 (64 bit)</li>
  <li>jupyter version 1.0.0-25</li>
  <li>pandas version 0.23.1-1</li>
  <li>python_dateutil version 2.6.0-1</li>
  </ul>
  
  <p>I'm not getting this complaint when I run with the Canopy Editor so it must be some jupyter compatibility problem.  Does anyone have a solution on how to fix this?  All was well a few months ago until I recently (and mindlessly) allowed an update of my packages.</p>