Update CHANGELOG.md

Author: stack72

CHANGELOG.md

@@ -15,6 +15,7 @@ FEATURES:
  * **New Provider:** `pagerduty` [GH-9022]
  * **New Resource:** `azurerm_key_vault` [GH-9478]
  * **New Resource:** `azurerm_storage_share` [GH-8674]
+ * **New Resource:** `azurerm_eventhub_namespace` [GH-9297]
  * **New DataSource:** `azurerm_client_config` [GH-9478]
 
 IMPROVEMENTS: