Enable package validation.

Don't use PackageValidationBaselineVersion against 1.1.0 as the next version is dropping net40 support.

Author: bgrainger

src/PcgRandom/PcgRandom.csproj

@@ -21,6 +21,7 @@
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
     <MinVerDefaultPreReleaseIdentifiers>beta.0</MinVerDefaultPreReleaseIdentifiers>
+    <EnablePackageValidation>true</EnablePackageValidation>
 </PropertyGroup>
 
   <PropertyGroup Condition=" '$(GITHUB_ACTIONS)' == 'true' OR '$(APPVEYOR)' == 'True' OR '$(TF_BUILD)' == 'True' ">