update ms.date date

Author: spboyer

articles/azure-cache-for-redis/cache-dotnet-how-to-use-azure-redis-cache.md

@@ -7,7 +7,7 @@ ms.service: cache
 ms.devlang: dotnet
 ms.topic: quickstart
 ms.custom: mvc
-ms.date: 05/18/2018
+ms.date: 03/11/2020
 
 #Customer intent: As a .NET developer, new to Azure Cache for Redis, I want to create a new .NET app that uses Azure Cache for Redis.
 ---