Product version in Visual Studio incorrectly says F# 4.6, not F# 4.7

From 16.5 previews:

![image](https://user-images.githubusercontent.com/6309070/71112250-f0a30480-217f-11ea-8202-34d445c08970.png)

From 16.4:

![image](https://user-images.githubusercontent.com/6309070/71112281-031d3e00-2180-11ea-8ddf-77de274e47fc.png)
