README.md in mailkick-1.0.0 vs README.md in mailkick-1.0.1

@@ -95,10 +95,10 @@
   opt_outs.each do |opt_out|
     subscriber = subscribers[opt_out[:email]]
     next unless subscriber
 
     subscriber.mailkick_subscriptions.each do |subscription|
-      subscription.destroy if subscription.updated_at < opt_out[:time]
+      subscription.destroy if subscription.created_at < opt_out[:time]
     end
   end
 end
 ```