Update README.md

Author: cp2boston

README.md

@@ -8,7 +8,7 @@ See the [wiki](https://github.com/rosette-api/php/wiki) for more information.
 Installation
 ------------
 
-`composer require "rosette/api: ~1.1"`
+`composer require "rosette/api: ~1.2"`
 
 Basic Usage
 -----------