Update CHANGELOG.md to include #2024

CHANGELOG.md

@@ -37,8 +37,9 @@ BUG FIXES:
 * `azurerm_virtual_machine_scale_set` - `primary` is now required within the `ip_configuration` block within `network_profile` (matching a behavioural change with the Azure API) [GH-2035]
 
 IMPROVEMENTS:
-Adding  to  datasource
+
 * `azurerm_application_gateway` - support for the `StandardV2` and `WAFV2` skus and tiers [GH-2015]
+* `azurerm_container_group` - adding the `secure_environment_variables` property [GH-2024]
 * `azurerm_dev_test_virtual_network` - support for managing the Subnet [GH-2041]
 * `azurerm_key_vault` - support for Virtual Network Rules [GH-2027]
 * `azurerm_kubernetes_cluster` - changing the `oms_agent` property no longer forces a new resource [GH-2021]
@@ -49,6 +50,7 @@ Adding  to  datasource
 * `azurerm_storage_container` - changing `container_access_type` no longer forces a new resource [GH-2075]
 * `azurerm_user_assigned_identity` - now exports the `client_id` property [GH-2078]
 
+
 ## 1.16.0 (October 01, 2018)
 
 UPGRADE NOTES: