update to use apigateway-0.11.0 (#518)

diff --git a/helm/openwhisk/values.yaml b/helm/openwhisk/values.yaml
index dfea9c5..b829cb4 100644
--- a/helm/openwhisk/values.yaml
+++ b/helm/openwhisk/values.yaml
@@ -285,7 +285,7 @@
 # API Gateway configurations
 apigw:
   imageName: "openwhisk/apigateway"
-  imageTag: "0.10.0-incubating"
+  imageTag: "0.11.0"
   imagePullPolicy: "IfNotPresent"
   # NOTE: setting replicaCount > 1 is not tested and may not work
   replicaCount: 1