Update the Visual Studio install component

please update the Visual Studio install component when installing unity, it still using 2017 version since the 2019 is already out.

Visual Studio 2019 isn’t working properly for everyone. Until Microsoft has fixed all the problems the last thing we need is for new developers to install it. I’ve already had to tell a few people to either downgrade or choose Visual Studio Code as it is and don’t want to have to tell more.

I waited until Visual Studio Installer proposes VS 2019 before switching to it. I made a few tests and it’s working, at least intellisense works fine. :wink: