message: doc: Add MSVC Build Tools option to Windows requisites
diff: @@ -21,9 +21,11 @@ Prerequisites
  - [Rimraf](https://github.com/isaacs/rimraf)
  - [NSIS v2.51](http://nsis.sourceforge.net/Main_Page) (v3.x won't work)
  +- Either one of the following:
  + - [Visual C++ 2015 Build Tools](http://landinghub.visualstudio.com/visual-cpp-build-tools) containing standalone compilers, libraries and scripts
  - [Visual Studio Community 2015](https://www.microsoft.com/en-us/download/details.aspx?id=48146) (free) (other editions, like Professional and Enterprise, should work too)
  - - Visual Studio 2015 doesn't install C++ by default. You have to rerun the
  - setup, select Modify and then check `Visual C++ -> Common Tools for Visual
  + **NOTE:** Visual Studio 2015 doesn't install C++ by default. You have to rerun the
  + setup, select "Modify" and then check `Visual C++ -> Common Tools for Visual
  C++ 2015` (see http://stackoverflow.com/a/31955339)
  - [MinGW](http://www.mingw.org)
  