Fixed typo: Simple Setup with Preamke

Working-on-Windows.md

@@ -1,6 +1,6 @@
 ## Building raylib on Windows
 
-## Simple Setup using Preamke
+## Simple Setup using Premake
 The fastest way to get a game setup on windows with MinGW or Visual Studio is to use premake.
 See https://github.com/raylib-extras/game-premake for instructions