Set license expression.

common.props

@@ -5,13 +5,12 @@
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <PackageIconUrl>https://abp.io/assets/abp_nupkg.png</PackageIconUrl>
     <PackageProjectUrl>https://abp.io/</PackageProjectUrl>
-    <PackageLicenseFile>LICENSE.md</PackageLicenseFile>
+    <PackageLicenseExpression>LGPL-3.0-only</PackageLicenseExpression>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/abpframework/abp/</RepositoryUrl>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="SourceLink.Create.CommandLine" Version="2.8.3" PrivateAssets="All" />
-	<None Include="LICENSE.md" Pack="true" PackagePath=""/>
   </ItemGroup>
 </Project>