Merge pull request iugu#8 from bsoares/api/new-methods

Changes in change_plan methods

Author: lucasprag

lib/iugu/subscription.rb

@@ -41,15 +41,21 @@ def activate
       false
     end
 
-    def change_plan(plan_identifier)
-      copy Iugu::Factory.create_from_response(self.class.object_type, APIRequest.request("POST", "#{self.class.url(self.id)}/change_plan/#{plan_identifier}"))
+    def change_plan(plan_identifier, options = {})
+      options.merge!({ plan_identifier: plan_identifier })
+      copy Iugu::Factory.create_from_response(self.class.object_type, APIRequest.request("POST", "#{self.class.url(self.id)}/change_plan", options))
       self.errors = nil
       true
     rescue Iugu::RequestWithErrors => ex
       self.errors = ex.errors
       false
     end
 
+    def change_plan_simulation(plan_identifier, options = {})
+      options.merge!({ plan_identifier: plan_identifier })
+      Iugu::Factory.create_from_response(self.class.object_type, APIRequest.request("GET", "#{self.class.url(self.id)}/change_plan_simulation", options))
+    end
+
     def customer
       return false unless @attributes['customer_id']
       Customer.fetch @attributes['customer_id']