DOC: remove reference to Python 2
DOC: remove reference to Python 2

Remove reference to Visual Studio version required by old versions
of Python. Python >= 3.5 is built with Microsoft Visual C++ 14.0 /
Visual Studio 2015:
	https://wiki.python.org/moin/WindowsCompilers

numpy/numpy,numpy/numpy,mattip/numpy,charris/numpy,charris/numpy,numpy/numpy,numpy/numpy,charris/numpy,mattip/numpy,mattip/numpy,mattip/numpy,charris/numpy