version note (#226)

Author: mongoKart

source/upgrade.txt

@@ -62,8 +62,9 @@ the version after v2.0 including any listed under v2.20.
 Version 2.28.0 Potential Breaking Change
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-- All {+driver-short+} components are strongly named. If your application
-  has dependencies that reference multiple {+driver-short+} versions, you must create
+- All {+driver-short+} components are strongly named. If you are using driver version
+  2.28 or later, and your application has dependencies that reference multiple
+  {+driver-short+} versions, you must create
   binding redirects, as shown in the following example:
 
   .. code-block:: csharp