Updated version detection code for .NET Framework 4.8 (#789)

Author: Ron Petrusha

snippets/csharp/framework/migration-guide/versions-installed3.cs

@@ -25,8 +25,8 @@ private static void Get45PlusFromRegistry()
       // Checking the version using >= enables forward compatibility.
       string CheckFor45PlusVersion(int releaseKey)
       {
-         if (releaseKey > 461814)
-            return "4.7.2 or later";
+         if (releaseKey >= 528049)
+            return "4.8 or later";
          if (releaseKey >= 461808)
             return "4.7.2";
          if (releaseKey >= 461308)

snippets/visualbasic/framework/migration-guide/versions-installed3.vb

@@ -19,8 +19,8 @@ Public Module GetDotNetVersion
 
    ' Checking the version using >= will enable forward compatibility.
    Private Function CheckFor45PlusVersion(releaseKey As Integer) As String
-      If releaseKey > 461814 Then
-         Return "4.7.2 or later"
+      If releaseKey >= 528049 Then
+         Return "4.8 or later"
       Else If releaseKey >= 461808 Then
          Return "4.7.2" 
       Else If releaseKey >= 461308 Then