openML has dependency on Visual Studio Build Tools

[ikbenbeter]

When I was installing openML on windows, I had several issues. As it turns out, one of the packages included, netifaces, requires Visual C++ Build Tools to be installed. It would be helpful for future students with this issue if you include this information somewhere. Even if it is a very common program to have installed, I personally had recently emptied my hard disk so I did not have it installed. pip does not clearly state this package is required.

[joaquinvanschoren]

Thanks. I added a not about this on Canvas, but now also added it to the prerequisites file.
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