README.md in alipay-0.0.3 vs README.md in alipay-0.0.4

- old
+ new

@@ -13,11 +13,11 @@
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'alipay', '~> 0.0.3'
+gem 'alipay', '~> 0.0.4'
 ```
 
 or development version
 
 ```ruby
@@ -49,10 +49,10 @@
   :logistics_type    => 'DIRECT',
   :logistics_fee     => '0',
   :logistics_payment => 'SELLER_PAY',
   :price             => '10.00',
   :quantity          => 12,
-  :discount          => '20.00'
+  :discount          => '20.00',
   :return_url        => 'YOUR_ORDER_RETURN_URL', # https://writings.io/orders/20130801000001
   :notify_url        => 'YOUR_ORDER_NOTIFY_URL'  # https://writings.io/orders/20130801000001/alipay_notify
 }
 
 Alipay::Service.create_partner_trade_by_buyer_url(options)