Update CHANGELOG.md

Author: jtopjian

CHANGELOG.md

@@ -6,6 +6,8 @@ FEATURES:
  * **New resource:** `aws_api_gateway_account` [GH-6321]
  * **New resource:** `aws_api_gateway_authorizer` [GH-6320]
  * **New resource:** `vsphere_file` [GH-6401]
+ * **New resource:** `openstack_networking_secgroup_v2` [GH-6410]
+ * **New resource:** `openstack_networking_secgroup_rule_v2` [GH-6410]
 
 IMPROVEMENTS: