Updates the change log.

CHANGELOG.md

@@ -134,14 +134,14 @@ FEATURES:
 * **Support for Running Subproccesses Directly Without a Shell:** Consul agent checks and watches now support an `args` configuration which is a list of arguments to run for the subprocess, which runs the subprocess directly without a shell. The old `script` and `handler` configurations are now deprecated (specify a shell explicitly if you require one). A `-shell=false` option is also available on `consul lock`, `consul watch`, and `consul exec` to run the subprocesses associated with those without a shell. [[GH-3509](https://github.com/hashicorp/consul/issues/3509)]
 * **Sentinel Integration:** (Consul Enterprise) Consul's ACL system integrates with [Sentinel](https://www.consul.io/docs/guides/sentinel.html) to enable code policies that apply to KV writes.
 
-
 IMPROVEMENTS:
 
 * agent: Added support to detect public IPv4 and IPv6 addresses on AWS. [[GH-3471](https://github.com/hashicorp/consul/issues/3471)]
 * agent: Improved /v1/operator/raft/configuration endpoint which allows Consul to avoid an extra agent RPC call for the `consul operator raft list-peers` command. [[GH-3449](https://github.com/hashicorp/consul/issues/3449)]
 * agent: Improved ACL system for the KV store to support list permissions. This behavior can be opted in. For more information, see the [ACL Guide](https://www.consul.io/docs/guides/acl.html#list-policy-for-keys). [[GH-3511](https://github.com/hashicorp/consul/issues/3511)]
 * agent: Updates miekg/dns library to later version to pick up bug fixes and improvements. [[GH-3547](https://github.com/hashicorp/consul/issues/3547)]
 * agent: Added automatic retries to the RPC path, and a brief RPC drain time when servers leave. These changes make Consul more robust during graceful leaves of Consul servers, such as during upgrades, and help shield applications from "no leader" errors. These are configured with new [`performance`](https://www.consul.io/docs/agent/options.html#performance) options. [[GH-5414](https://github.com/hashicorp/consul/issues/5414)]
+* agent: Added a new `discard_check_output` agent-level configuration option that can be used to trade off write load to the Consul servers vs. visibility of health check output. This is reloadable so it can be toggled without fully restarting the agent. [[GH-3562](https://github.com/hashicorp/consul/issues/3562)]
 * build: Updated Go toolchain to version 1.9.1. [[GH-3537](https://github.com/hashicorp/consul/issues/3537)]
 * cli: `consul lock` and `consul watch` commands will forward `TERM` and `KILL` signals to their child subprocess. [[GH-3509](https://github.com/hashicorp/consul/issues/3509)]
 * cli: Added support for [autocompletion](https://www.consul.io/docs/commands/index.html#autocompletion). [[GH-3412](https://github.com/hashicorp/consul/issues/3412)]