Bump AssemblyNativeVersion to 100.1.6.1

- Was missing from #102.

***NO_CI***

Author: josesimoes

System.IO.Ports/Properties/AssemblyInfo.cs

@@ -2,7 +2,6 @@
 // See LICENSE file in the project root for full license information.
 
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following 
@@ -15,7 +14,7 @@
 
 ////////////////////////////////////////////////////////////////
 // update this whenever the native assembly signature changes //
-[assembly: AssemblyNativeVersion("100.1.6.0")]
+[assembly: AssemblyNativeVersion("100.1.6.1")]
 ////////////////////////////////////////////////////////////////
 
 // Setting ComVisible to false makes the types in this assembly not visible