Update modernize-connect-to-office365-group.md

Updating the date stamp at the to indicate an update to the article has taken place

Author: KoenZomers

docs/transform/modernize-connect-to-office365-group.md

@@ -1,7 +1,7 @@
 ---
 title: Connect to a Microsoft 365 group
 description: Connect a Microsoft 365 group to an existing SharePoint site to modernize it and have it benefit from all other group-connected services such as Microsoft Teams and Planner.
-ms.date: 04/23/2018
+ms.date: 01/14/2021
 ms.prod: sharepoint
 localization_priority: Priority
 ---