If you are happy that you are still using the new tool, the easiest way is probably to simply edit the project file (csproj). Right-click on the project in Solution Explorer and you should have the context menu option "Edit <yourproject> .proproj". Click on it and just change
<TargetFramework>netcoreapp1.1</TargetFramework>
to
<TargetFramework>net46</TargetFramework>
... and I suspect you will be fine. (It can be a bit confusing VS when it recovers the appropriate packages, etc.)
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