allow use on .NET 4.0 projects
allow use on .NET 4.0 projects

dsyme/FSharp.TypeProviders.StarterPack,tpetricek/FSharp.TypeProviders.StarterPack,mavnn/FSharp.TypeProviders.StarterPack,cloudRoutine/FSharp.TypeProviders.StarterPack,sergey-tihon/FSharp.TypeProviders.StarterPack,delegateas/FSharp.TypeProviders.StarterPack,fsprojects/FSharp.TypeProviders.StarterPack,mkb137/FSharp.TypeProviders.StarterPack,fsprojects/FSharp.TypeProviders.SDK,rflechner/FSharp.TypeProviders.StarterPack