Use PackageLicenseExpression instead of PackageLicenseUrl (#1322)

* Project: Convert 'PackageLicenseUrl' to 'PackageLicenseExpression'
* Project: Add 'Copyright' as specified in license

Author: wismann

src/Moq/Moq.csproj

@@ -31,8 +31,9 @@
 		<Description>Moq is the most popular and friendly mocking framework for .NET.</Description>
 		<PackageReleaseNotes>A changelog is available at https://github.com/moq/moq4/blob/main/CHANGELOG.md.</PackageReleaseNotes>
 		<Authors>Daniel Cazzulino, kzu</Authors>
+		<Copyright>Copyright (c) 2007, Clarius Consulting, Manas Technology Solutions, InSTEDD, and Contributors. All rights reserved.</Copyright>
 		<PackageIcon>moq.png</PackageIcon>
-		<PackageLicenseUrl>https://raw.githubusercontent.com/moq/moq4/main/License.txt</PackageLicenseUrl>
+		<PackageLicenseExpression>BSD-3-Clause</PackageLicenseExpression>
 		<PackageRequireLicenseAcceptance>False</PackageRequireLicenseAcceptance>
 		<NoPackageAnalysis>True</NoPackageAnalysis>
 		<PackageOutputPath>$(OutputDirectory)</PackageOutputPath>