Update README.md to reflect GKE Enterprise announcements

Author: ndebuhr

README.md

@@ -2,6 +2,8 @@
 
 > Isidro is an Anthos- and GKE-based microservices chatbot
 
+_Note that further unification of GKE and Anthos, via GKE Enterprise (announced at Next '23), may provide an easier way to run the full, multi-continental chatbot configuration_
+
 Isidro includes:
 * Prebuilt connectors to Slack and Mattermost for event subscription and response
 * Flexible, policy-based workflow planning
@@ -215,4 +217,4 @@ Mention @isidro in Slack messages, and get a response.  Use separate message thr
 curl -X POST https://api.example.com/v1/submit \
     -H "Content-Type: application/json" \
     -d '{"token": "1234567890", "event": {"channel": "quality", "ts": "1234567890", "user": "me", "text": "Hello"}}'
-```
+```