Use PackageIcon property (#2008)

Use PackageIcon instead of PackageIconUrl.

Author: martincostello

build/common.props

@@ -6,7 +6,7 @@
     <NeutralLanguage>en-US</NeutralLanguage>
     <Authors>.NET Foundation and contributors</Authors>
     <PackageTags>benchmark;benchmarking;performance</PackageTags>
-    <PackageIconUrl>https://raw.githubusercontent.com/dotnet/BenchmarkDotNet/master/docs/guide/logo.png</PackageIconUrl>
+    <PackageIcon>package-icon.png</PackageIcon>
     <PackageProjectUrl>https://github.com/dotnet/BenchmarkDotNet</PackageProjectUrl>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <RepositoryType>git</RepositoryType>
@@ -20,6 +20,10 @@
     <CodeAnalysisRuleSet>$(MSBuildThisFileDirectory)CodingStyle.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Include="$(MSBuildThisFileDirectory)package-icon.png" Pack="True" PackagePath="" />
+  </ItemGroup>
+
   <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)strongNameKey.snk</AssemblyOriginatorKeyFile>
     <SignAssembly>true</SignAssembly>