Fixed issue with adding EF tools package
Fixed issue with adding EF tools package

jongalloway/aspnetcore-app-workshop,dotnet-presentations/aspnetcore-app-workshop,anurse/ConferencePlanner,dotnet-presentations/aspnetcore-app-workshop,dotnet-presentations/aspnetcore-app-workshop,csharpfritz/aspnetcore-app-workshop,jongalloway/aspnetcore-app-workshop,csharpfritz/aspnetcore-app-workshop,csharpfritz/aspnetcore-app-workshop,anurse/ConferencePlanner,anurse/ConferencePlanner,csharpfritz/aspnetcore-app-workshop,dotnet-presentations/aspnetcore-app-workshop