Re-enable package validation

Author: ronaldbarendse

Directory.Build.props

@@ -28,8 +28,7 @@
   <!-- Package Validation -->
   <PropertyGroup>
     <GenerateCompatibilitySuppressionFile>false</GenerateCompatibilitySuppressionFile>
-    <!-- TODO (V15): Re-enable when 15 is released. -->
-    <EnablePackageValidation>false</EnablePackageValidation>
+    <EnablePackageValidation>true</EnablePackageValidation>
     <PackageValidationBaselineVersion>15.0.0</PackageValidationBaselineVersion>
     <EnableStrictModeForCompatibleFrameworksInPackage>true</EnableStrictModeForCompatibleFrameworksInPackage>
     <EnableStrictModeForCompatibleTfms>true</EnableStrictModeForCompatibleTfms>