Merge pull request iugu#9 from b2beauty/master

Segunda via

Author: lucasprag

lib/iugu/invoice.rb

@@ -27,5 +27,14 @@ def refund
       self.errors = ex.errors
       false
     end
+
+    def duplicate(due_date)
+      copy Iugu::Factory.create_from_response(self.class.object_type, APIRequest.request("POST", "#{self.class.url(self.id)}/duplicate", { due_date: due_date, ignore_canceled_email: true }))
+      self.errors = nil
+      true
+    rescue Iugu::RequestWithErrors => ex
+      self.errors = ex.errors
+      false
+    end
   end
 end