Update CHANGELOG.md (#1866)

* Update CHANGELOG.md

* Unreleased note

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* Upgrade settings note

Author: slevenick

CHANGELOG.md

@@ -1,4 +1,16 @@
 ## 3.14.0 (Unreleased)
+
+FEATURES:
+* **New Data Source:** `google_compute_instance_serial_port` ([#1860](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1860))
+* **New Resource:** `google_compute_region_ssl_certificate` ([#1863](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1863))
+
+IMPROVEMENTS:
+* compute: Added new attribute reference `current_status` to the `google_compute_instance` resource ([#1857](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1857))
+* container: Added `dns_cache_config` field to `google_container_cluster` resource ([#1853](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1853))
+* container: Updated `upgrade_settings` to read defaults from API for the `google_container_node_pool` resource ([#1859](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1859))
+* provider: Added provider-wide request retries for common temporary GCP error codes and network errors ([#1856](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1856))
+* redis: Added `connect_mode` field to `google_redis_instance` resource ([#1854](https://github.com/terraform-providers/terraform-provider-google-beta/pull/1854))
+
 ## 3.13.0 (March 16, 2020)
 
 BREAKING CHANGES: