invoice.rb in recurly-2.4.0

- old
+ new

@@ -15,9 +15,11 @@
 
     # @return [Account]
     belongs_to :account
     # @return [Subscription]
     belongs_to :subscription
+    # @return [Invoice]
+    belongs_to :original_invoice, class_name: 'Invoice'
 
     # @return [Redemption]
     has_one :redemption
 
     define_attribute_methods %w(