Update CHANGELOG.md

Author: c2thorn

CHANGELOG.md

@@ -14,7 +14,6 @@ IMPROVEMENTS:
 * compute: Added support for `google_compute_instance` `resource_policies` field ([#1839](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1839))
 * compute: Added support for `google_compute_resource_policy` group placement policies ([#1839](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1839))
 * compute: Added support for full-name/id `network_endpoint_group` value in `google_network_endpoint` ([#1831](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1831))
-* compute: moved `google_compute_router_nat`'s `drain_nat_ips` from beta to ga. ([#1821](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1821))
 * dialogflow: Changed `google_dialogflow_agent` to not read `tier` status ([#1829](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1829))
 * monitoring: Added `sensitive_labels` to `google_monitoring_notification_channel` so that labels like `password` and `auth_token` can be managed separately from the other labels and marked as sensitive. ([#1844](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1844))