Updating readme based on new flag for webhook

* Adding volumesnapshotclasses to admission configuration template

Author: Shawn Hurley

README.md

@@ -128,7 +128,7 @@ Read more about how to install the example webhook [here](deploy/kubernetes/webh
 
 ##### Volume Snapshot Classes
 
-* There can only be a single default volume snapshot class for a particular driver. 
+* There can only be a single default volume snapshot class for a particular driver.
 
 ### Distributed Snapshotting
 

deploy/kubernetes/webhook-example/admission-configuration-template

@@ -8,7 +8,7 @@ webhooks:
   - apiGroups:   ["snapshot.storage.k8s.io"]
     apiVersions: ["v1", "v1beta1"]
     operations:  ["CREATE", "UPDATE"]
-    resources:   ["volumesnapshots", "volumesnapshotcontents"]
+    resources:   ["volumesnapshots", "volumesnapshotcontents", "volumesnapshotclasses"]
     scope:       "*"
   clientConfig:
     service: