Add permission to the events (#733)

Author: style95

helm/openwhisk/templates/invoker-role.yaml

@@ -34,6 +34,9 @@ rules:
 - apiGroups: [""]
   resources: ["pods"]
   verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
+- apiGroups: [""]
+  resources: ["events"]
+  verbs: ["get", "list"]
 - apiGroups: [""]
   resources: ["pods/log"]
   verbs: ["get", "list"]