title: ValueError: not enough values to unpack (expected 3, got 2) using Contour in OpenCV
body: <p>So I am getting this error after i updated all the packages.</p>
  
  <pre><code>    &lt;ipython-input-48-e9a9716d4b8c&gt; in extractText(path)
       15     plt.show()
       16 
  ---&gt; 17     img, contours, hierarchy = cv2.findContours(edged, cv2.RETR_LIST, cv2.CHAIN_APPROX_NONE)
       18     contours = sorted(contours, key=cv2.contourArea, reverse=True)
       19 
  
  ValueError: not enough values to unpack (expected 3, got 2)
  </code></pre>