Add #268 to changelog

Author: morgante

CHANGELOG.md

@@ -13,6 +13,7 @@ Extending the adopted spec, each change should have a link to its corresponding
 * Support for Shielded Nodes beta feature via `enabled_shielded_nodes` variable. [#300]
 * Support for setting node_locations on node pools. [#303]
 * Fix for specifying  `node_count` on node pools when autoscaling is disabled. [#311]
+* Added submodule for installing Anthos Config Management. [#268]
 
 ## [v5.1.1] - 2019-10-25
 
@@ -227,6 +228,7 @@ In either case, upgrading to module version `v1.0.0` will trigger a recreation o
 [v0.3.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v0.2.0...v0.3.0
 [v0.2.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v0.1.0...v0.2.0
 
+[#268]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/issues/268
 [#311]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/issues/311
 [#303]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/303
 [#300]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/300