Visual Studio link in README.md returns 404

[KoesterD]

The link leading to the latest preview of Visual Studio 2015 in the paragraph "Getting Started on Windows" is broken. It returns a 404:

$ wget http://go.microsoft.com/fwlink/?LinkId=521794
--2015-12-20 21:47:30--  http://go.microsoft.com/fwlink/?LinkId=521794
Resolving go.microsoft.com... 2a02:26f0:64:28b::2c1a, 2a02:26f0:64:28d::2c1a, 184.25.216.99
Connecting to go.microsoft.com|2a02:26f0:64:28b::2c1a|:80... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: http://download.microsoft.com/download/C/A/A/CAA39018-05E5-49BA-8B24-4FC056EEA392/vs_enterprise.exe [following]
--2015-12-20 21:47:30--  http://download.microsoft.com/download/C/A/A/CAA39018-05E5-49BA-8B24-4FC056EEA392/vs_enterprise.exe
Resolving download.microsoft.com... 2a02:26f0:64:284::e59, 2a02:26f0:64:28b::e59, 184.30.214.45
Connecting to download.microsoft.com|2a02:26f0:64:284::e59|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2015-12-20 21:47:31 ERROR 404: Not Found.

[Tratcher]

Changed to https://www.visualstudio.com/en-us/downloads/download-visual-studio-vs.aspx