setup.md

@@ -9,6 +9,7 @@
  * Make sure to configure it for c++ Desktop-Programming
  * Add at least the following packages:
    ``Windows Universal CRT SDK``
+   ``Windows 8.1 SDK``
  * _Any particular packages that must be there? Add here!_
  * To setup Clangformat (recomnmended) see [Clang Wiki-Page](clang-format_on-save_VS2017)
 * Use CMake (beware that the first time it could take very long since all dependecies are downloaded through conan)