adds after_hide hook to paranoid aliases

lib/acts_as_paranoid_aliases.rb

@@ -5,11 +5,15 @@ module ActsAsParanoidAliases
 
     def hide
       update_attribute(:hidden_at, Time.now)
+      after_hide
     end
 
     def hidden?
       deleted?
     end
+
+    def after_hide
+    end
   end
 
   module ClassMethods