README.md in alipay-0.16.0 vs README.md in alipay-0.17.0

@@ -10,20 +10,20 @@
 
 To install using [Bundler](http://bundler.io/). Add this line to your
 application's Gemfile:
 
 ```ruby
-gem 'alipay', '~> 0.15.1'
+gem 'alipay'
 ```
 
 Then run:
 ```bash
 $ bundle
 ```
 
 Or you can manually install using [RubyGems](http://rubygems.org/):
 ```bash
-$ gem install alipay -v 0.15.1
+$ gem install alipay
 ```
 
 ## Getting Started
 
 This gem needs to be configured with your application's private key for Alipay and Alipay's public key. Here is a [quick guide](doc/rsa_key_en.md) on generating RSA key for use with this gem to get you started.