Update CHANGELOG.md

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## UNRELEASED
BREAKING CHANGES:
* agent: The following previously deprecated fields and config options have been removed:
- `CheckID` has been removed from config file check definitions (use `id` instead).
- `script` has been removed from config file check definitions (use `args` instead).
- `enableTagOverride` is no longer valid in service definitions (use `enable_tag_override` instead).
- The [deprecated set of metric names](https://consul.io/docs/upgrade-specific.html#metric-names-updated) (beginning with `consul.consul.`) has been removed along with the `enable_deprecated_names` option from the metrics configuration.
IMPROVEMENTS:
* agent: Improve DNS performance on large clusters [[GH-4036](https://github.com/hashicorp/consul/issues/4036)]
* api: Add support for Prometheus client format in metrics endpoint with `?format=prometheus` (see [docs](https://www.consul.io/api/agent.html#view-metrics)) [[GH-4014](https://github.com/hashicorp/consul/issues/4014)]