adding F# core deps, still not working:

Compilation errors:
 - (0, 0) Assuming assembly reference `FSharp.Core, Version=4.3.0.0,
   Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' matches assembly
`FSharp.Core, Version=4.3.1.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a'. You may need to supply runtime policy