Updates the change log.

CHANGELOG.md

@@ -136,6 +136,7 @@ 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)]
+* 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)]
 * server: Updated BoltDB to final version 1.3.1. [[GH-3502](https://github.com/hashicorp/consul/issues/3502)]
 * server: Improved dead member reap algorithm to fix edge cases where servers could get left behind. [[GH-3452](https://github.com/hashicorp/consul/issues/3452)]