Updated the ms.date

Updated the date as we've gotten approval for the topic to go and we can push out the changes.

Author: CelesteDG

articles/active-directory/develop/howto-get-appsource-certified.md

@@ -14,7 +14,7 @@ ms.devlang: na
 ms.topic: article
 ms.tgt_pltfrm: na
 ms.workload: identity
-ms.date: 08/03/2017
+ms.date: 08/21/2018
 ms.author: celested
 ms.reviewer: andret
 ms.custom: aaddev