New filter for get_subscription() return

I recently had to modify authorizenet.php in order to customize the subscription behavior. It's working, but now I can't upgrade the plugin because my changes will be overwritten. Can you please add the following filter to get_subscription() so that I won't need to modify the plugin itself anymore?

I changed line 2072 from:

return $subscription;

...to:

return apply_filters("gform_authorizenet_get_subscription", $subscription);

Cool, thanks.