Targeting netstandard2.0 for scanandsign.core (#10209)

Author: agr

src/Validation.ScanAndSign.Core/Validation.ScanAndSign.Core.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net472</TargetFramework>
+    <TargetFrameworks>net472;netstandard2.0</TargetFrameworks>
     <PackageVersion Condition="'$(PackageVersion)' == ''">$(JobsPackageVersion)</PackageVersion>
     <RootNamespace>NuGet.Jobs.Validation.ScanAndSign</RootNamespace>
     <AssemblyName>NuGet.Jobs.Validation.ScanAndSign.Core</AssemblyName>