Fixed up the GAE service definition

Author: mcasperson

app.yaml

@@ -2,4 +2,12 @@
 # gcloud app deploy .\target\randomquotes.0.1.9.jar --appyaml .\app.yaml
 
 runtime: java11
-service: default
+service: default
+instance_class: F2
+
+health_check:
+  enable_health_check: False
+  check_interval_sec: 60
+  timeout_sec: 4
+  unhealthy_threshold: 2
+  healthy_threshold: 2