Update CHANGELOG.md

CHANGELOG.md

@@ -102,6 +102,8 @@ BREAKING CHANGES:
 
 * **Unauthorized KV Requests Return 403:** When ACLs are enabled, reading a key with an unauthorized token returns a 403. This previously returned a 404 response.
 * **Config Section of Agent Self Endpoint has Changed:** The /v1/agent/self endpoint's `Config` section has often been in flux as it was directly returning one of Consul's internal data structures. This configuration structure has been moved under `DebugConfig`, and is documents as for debugging use and subject to change, and a small set of elements of `Config` have been maintained and documented. See [Read Configuration](https://www.consul.io/api/agent.html#read-configuration) endpoint documentation for details. [[GH-3532](https://github.com/hashicorp/consul/issues/3532)]
+* **Deprecated `configtest` Command Removed:** The `configtest` command was deprecated and has been superseded by the `validate` command.
+* **Undocumented Flags in `validate` Command Removed:** The `validate` command supported the `-config-file` and `-config-dir` command line flags but did not document them. This support has been removed since the flags are not required.
 * **Metric Names Updated:** Fixed an issue where some of the internal Consul metric names began with `consul.consul.` instead of `consul.`. To help with transitioning dashboards and other metric consumers, the field `enable_deprecated_names` has been added to the telemetry section of the config, which will enable metrics with the old naming scheme to be sent alongside the new ones.
 
     <details><summary>Detailed List of Affected Metrics by Prefix</summary>