Fix .NET Core Sqlite tests

Author: xplicit

tests/ServiceStack.OrmLite.SqliteTests/ServiceStack.OrmLite.SqliteTests.csproj

@@ -66,6 +66,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.0' ">
+    <PackageReference Include="Microsoft.Extensions.Primitives" Version="1.1.1" />
     <PackageReference Include="System.Runtime" Version="4.*" />
     <PackageReference Include="System.Runtime.Serialization.Xml" Version="4.*" />
     <PackageReference Include="System.Reflection" Version="4.*" />