Rackspace Auto Scale: Add policies Update()
diff --git a/rackspace/autoscale/v1/policies/results.go b/rackspace/autoscale/v1/policies/results.go
index e92d636..f63b1a7 100644
--- a/rackspace/autoscale/v1/policies/results.go
+++ b/rackspace/autoscale/v1/policies/results.go
@@ -47,6 +47,11 @@
 	policyResult
 }
 
+// UpdateResult represents the result of an update operation.
+type UpdateResult struct {
+	gophercloud.ErrResult
+}
+
 // Policy represents a scaling policy.
 type Policy struct {
 	// UUID for the policy.