Compliance with CLS-Compliant Code spec

package.props

@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <Version>5.2.0</Version>
+    <Version>5.2.1</Version>
     <PackageReleaseNotes>This package is compatible with .NET 4.5, 4.6, and 4.7 frameworks.</PackageReleaseNotes>
   </PropertyGroup>
 

src/Properties/AssemblyInfo.cs

@@ -0,0 +1,3 @@
+using System;
+
+[assembly:CLSCompliant(true)]