title: Plotly package no module named 'retrying'
body: <p>I searched for a long time for solution about my problem but I wasn't able to find.
  I'm using anaconda with python 3.7.4.
  When I try to launch my app.py file, I got this error.
  Of course, I downloaded Plotly 4.6 using the tar.bz2 file and using "conda install plotly4.6.0.tar.bz2" (I needed this as i do it offline).</p>
  
  <pre><code>Traceback (most recent call last):
    File "app.py", line 9, in &lt;module&gt;
      import plotly
    File "C:\ProgramData\Anaconda3\lib\site-packages\plotly\__init__.py", line 30,
   in &lt;module&gt;
      from plotly import (
    File "C:\ProgramData\Anaconda3\lib\site-packages\plotly\io\__init__.py", line
  1, in &lt;module&gt;
      from ._orca import to_image, write_image
    File "C:\ProgramData\Anaconda3\lib\site-packages\plotly\io\_orca.py", line 14,
   in &lt;module&gt;
      import retrying
  ModuleNotFoundError: No module named 'retrying'
  </code></pre>
  
  <p>I have no idea where this problem is coming from.
  Thanks.</p>