Enable .NET SDK package validation (#240)

Author: rainersigwald

src/MSBuildLocator/Microsoft.Build.Locator.csproj

@@ -14,6 +14,9 @@
 
     <Title>MSBuild Locator</Title>
     <Description>Package that assists in locating and using a copy of MSBuild installed as part of Visual Studio 2017 or higher or .NET Core SDK 2.1 or higher.</Description>
+
+    <EnablePackageValidation>true</EnablePackageValidation>
+    <PackageValidationBaselineVersion>1.6.1</PackageValidationBaselineVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)'=='net46'">