Update OpenIddict.Tests.csproj to add a net47 target

test/OpenIddict.Tests/OpenIddict.Tests.csproj

@@ -4,6 +4,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
+    <TargetFrameworks Condition=" $([Microsoft.Build.Utilities.ToolLocationHelper]::GetPathToReferenceAssemblies('.NETFramework', '4.7', '').Count) != 0 ">$(TargetFrameworks);net47</TargetFrameworks>
     <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netcoreapp2.0</TargetFrameworks>
   </PropertyGroup>
 
@@ -34,7 +35,7 @@
     <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
   </ItemGroup>
 
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.0' ">
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net47' Or '$(TargetFramework)' == 'netcoreapp2.0' ">
     <DefineConstants>$(DefineConstants);SUPPORTS_ECDSA</DefineConstants>
   </PropertyGroup>