Adding DeleteResult for rackspace.blockstorage.v1.volumes.Delete
diff --git a/rackspace/blockstorage/v1/volumes/delegate.go b/rackspace/blockstorage/v1/volumes/delegate.go
index 4f14454..eb9ae56 100644
--- a/rackspace/blockstorage/v1/volumes/delegate.go
+++ b/rackspace/blockstorage/v1/volumes/delegate.go
@@ -28,8 +28,8 @@
 }
 
 // Delete will delete the existing Volume with the provided ID.
-func Delete(client *gophercloud.ServiceClient, id string) error {
-	return os.Delete(client, id)
+func Delete(client *gophercloud.ServiceClient, id string) DeleteResult {
+	return DeleteResult{os.Delete(client, id)}
 }
 
 // Get retrieves the Volume with the provided ID. To extract the Volume object