Add note about robot comments

Change-Id: If9636eb53ad3cabd3a0a8d51cd511604db39ae6c

src/zuulv3/gus2019.rst

@@ -725,8 +725,8 @@ What about job content?
   * Ansible is excellent at running one or more tasks in one or more places
   * The answer to "how do I" is almost always "Ansible"
 
-Checks Plugin Collaboration
-===========================
+Checks Plugin
+=============
 
   * Learned about checks plugin in Gothenburg
   * Added support for checks plugin to Zuul
@@ -741,6 +741,13 @@ OpenDev Zuul Verifies Checks Plugins Changes Using Checks API
 
 https://gerrit-review.googlesource.com/c/plugins/checks/+/245796
 
+Future Work
+===========
+
+  * Robot comments instead of inline comments
+  * https://review.opendev.org/#/c/682601/4/.zuul.yaml
+  * Sub-checks
+
 Sub-checks
 ==========