README.md in validates_cnpj-3.0.0 vs README.md in validates_cnpj-3.1.0

- old
+ new
@@ -1,9 +1,10 @@
 # ValidatesCnpj 
 
 [![Gem Version](https://badge.fury.io/rb/validates_cnpj.png)](http://badge.fury.io/rb/validates_cnpj) [![Build Status](https://secure.travis-ci.org/plribeiro3000/validates_cnpj.png?branch=master)](http://travis-ci.org/plribeiro3000/validates_cnpj) [![Coverage Status](https://coveralls.io/repos/plribeiro3000/validates_cnpj/badge.png?branch=master)](https://coveralls.io/r/plribeiro3000/validates_cnpj)  [![Code Climate](https://codeclimate.com/github/plribeiro3000/validates_cnpj.png)](https://codeclimate.com/github/plribeiro3000/validates_cnpj)
 
-Validates cnpj and test it in a simple way
+Validates cnpj and test it in a simple way.
+Supports ruby 2.2+ and rails 3+.
 
 ## Installation
 
 Add this line to your application's Gemfile:
 
\ No newline at end of file