Add EDM to class library

Hi!

Problem : I can't add an ADO.net Entity Data Model to a class library, since I upgraded to ASP 5.

EDIT: I also tried to install Entity Framework 6 in a class library, but it fails and give this error:

Severity Code Description Project File Line Suppression State
Error NU1002 The dependency EntityFramework 6.1.3 in project ClassLibrary1 does
not support framework .NETPlatform,Version=v5.4. ClassLibrary1
D:\data\isak\Visual Studio 2015\Projects\Web\WebApplication1\ClassLibrary1\project.json 21