README.md in paddle-1.1.2 vs README.md in paddle-2.0.0

@@ -5,10 +5,10 @@
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby
-gem "paddle"
+gem "paddle", "~> 2.0"
 ```
 
 ## Billing API
 
 For accessing the new Billing API from Paddle. For more info, view the [Paddle Billing](https://www.paddle.com/billing) page.