Update winbuild/README.md

Co-authored-by: Andrew Murray <[email protected]>

Author: hugovk

winbuild/README.md

@@ -11,7 +11,8 @@ 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 2022 with Visual Studio 2022 Enterprise (GitHub Actions).
+* Tested on Windows Server 2022 with Visual Studio 2022 Enterprise and Windows Server
+  2019 with Visual Studio 2019 Enterprise (GitHub Actions).
 
 Here's an example script to build on Windows: