Fixed up the GAE service definition

Author: mcasperson

app.yaml

@@ -1,10 +1,5 @@
 # Deploy with:
 # gcloud app deploy .\target\randomquotes.0.1.9.jar --appyaml .\app.yaml
 
-runtime: java
-env: flex
-service: randomquotes
-
-handlers:
-  - url: /.*
-    script: this field is required, but ignored
+runtime: java11
+service: default