Restore NUnit3TestAdapter

Author: manuc66

JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj

@@ -17,6 +17,7 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
     <PackageReference Include="TaskParallelLibrary" Version="1.0.2856.0" />
   </ItemGroup>
   <ItemGroup>

JsonSubTypes.Tests/JsonSubTypes.Tests.csproj

@@ -18,6 +18,7 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\JsonSubTypes\JsonSubTypes.csproj" />