Update README.md

Add note about the old screenshots.
cwant · Apr 29, 2017 · 289857b · 289857b
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 **This code has been tested with Blender 2.78 and VTK 7.1.1**
 
+**Note that the screenshots below haven't been updated and
+reflect the user interface from pre-2.5 Blender.**
+
 ## Introduction
 
 [VTK](http://www.vtk.org/) is a great visualization library and