Updated test environment documentation

Author: radarhere

winbuild/README.md

@@ -11,7 +11,7 @@ For more extensive info, see the [Windows build instructions](build.rst).
 * Requires Microsoft Visual Studio 2017 or newer with C++ component.
 * Requires NASM for libjpeg-turbo, a required dependency when using this script.
 * Requires CMake 3.15 or newer (available as Visual Studio component).
-* Tested on Windows Server 2016 with Visual Studio 2017 Community, and Windows Server 2019 with Visual Studio 2022 Community (AppVeyor).
+* Tested on Windows Server 2019 with Visual Studio 2019 Community and Visual Studio 2022 Community (AppVeyor).
 * Tested on Windows Server 2022 with Visual Studio 2022 Enterprise (GitHub Actions).
 
 The following is a simplified version of the script used on AppVeyor: