Add PackageIcon as PackageIconUrl in going to be deprecated (see https://docs.microsoft.com/en-us/nuget/reference/msbuild-targets#packageiconurl)

Author: tebeco

src/Serilog.AspNetCore/Serilog.AspNetCore.csproj

@@ -11,6 +11,7 @@
     <SignAssembly>true</SignAssembly>
     <PublicSign Condition=" '$(OS)' != 'Windows_NT' ">true</PublicSign>
     <PackageTags>serilog;aspnet;aspnetcore</PackageTags>
+    <PackageIcon>serilog-extension-nuget.png</PackageIcon>
     <PackageIconUrl>https://serilog.net/images/serilog-extension-nuget.png</PackageIconUrl>
     <PackageProjectUrl>https://github.com/serilog/serilog-aspnetcore</PackageProjectUrl>
     <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
@@ -20,6 +21,10 @@
     <RootNamespace>Serilog</RootNamespace>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Include="images/serilog-extension-nuget.png" Pack="true" PackagePath="/" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Serilog" Version="2.9.0" />
     <PackageReference Include="Serilog.Extensions.Hosting" Version="3.0.0" />
@@ -38,6 +43,7 @@
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.*" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.*" />
   </ItemGroup>