Add AssemblyNativeVersion

Author: josesimoes

source/nanoFramework.System.Net/Properties/AssemblyInfo.cs

@@ -10,6 +10,11 @@
 [assembly: AssemblyProduct("System.Net")]
 [assembly: AssemblyCopyright("Copyright © nanoFramework Contributors 2018")]
 
+////////////////////////////////////////////////////////////////
+// update this whenever the native assembly signature changes //
+[assembly: AssemblyNativeVersion("1.0.6.0")]
+////////////////////////////////////////////////////////////////
+
 // Setting ComVisible to false makes the types in this assembly not visible 
 // to COM components.  If you need to access a type in this assembly from 
 // COM, set the ComVisible attribute to true on that type.