fixed missing reference in AppConfigDemo app

Author: vlm---

sample/AppConfigDemo/AppConfigDemo.csproj

@@ -36,8 +36,11 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Extensions.Configuration.Abstractions, Version=3.1.4.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
-    <HintPath>..\..\packages\Microsoft.Extensions.Configuration.Abstractions.3.1.4\lib\netstandard2.0\Microsoft.Extensions.Configuration.Abstractions.dll</HintPath>
-  </Reference>
+      <HintPath>..\..\packages\Microsoft.Extensions.Configuration.Abstractions.3.1.4\lib\netstandard2.0\Microsoft.Extensions.Configuration.Abstractions.dll</HintPath>
+    </Reference>
+    <Reference Include="Serilog, Version=2.0.0.0, Culture=neutral, PublicKeyToken=24c2f752a8e58a10, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Serilog.2.9.0\lib\net46\Serilog.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Configuration" />
     <Reference Include="System.Core" />
@@ -81,4 +84,4 @@
     </PropertyGroup>
     <Error Condition="!Exists('..\..\packages\Microsoft.Data.SqlClient.SNI.1.1.0\build\net46\Microsoft.Data.SqlClient.SNI.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Data.SqlClient.SNI.1.1.0\build\net46\Microsoft.Data.SqlClient.SNI.targets'))" />
   </Target>
-</Project>
+</Project>