Fix external-dns default RBAC API version (#3552)

Introduced in https://github.com/kubernetes/charts/pull/3404

stable/external-dns/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 description: Configure external DNS servers (AWS Route53, Google CloudDNS and others)
   for Kubernetes Ingresses and Services
 name: external-dns
-version: 0.4.6
+version: 0.4.7
 appVersion: 0.4.8
 home: https://github.com/kubernetes-incubator/external-dns
 sources:

stable/external-dns/values.yaml

@@ -78,7 +78,7 @@ rbac:
   ##
   create: false
   # Beginning with Kubernetes 1.8, the api is stable and v1 can be used.
-  apiVersion: v1beta
+  apiVersion: v1beta1
 
   ## Ignored if rbac.create is true
   ##