README.md in alipay-0.4.1 vs README.md in alipay-0.5.0

- old
+ new

@@ -14,11 +14,11 @@
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'alipay', '~> 0.4.1'
+gem 'alipay', '~> 0.5.0'
 ```
 
 or development version
 
 ```ruby
@@ -37,9 +37,10 @@
 
 ```ruby
 Alipay.pid = 'YOUR_PID'
 Alipay.key = 'YOUR_KEY'
 Alipay.seller_email = 'YOUR_SELLER_EMAIL'
+Alipay.debug_mode = true # Default is true. Example for rails: !Rails.env.production?
 ```
 
 ### Generate payment url for web
 
 ```ruby