Adding a Node.js library (ratify) to the README

Author: mac-

README.md

@@ -116,6 +116,7 @@ These are third party tools generated by the Swagger community:
 - [swaggerize-hapi](https://github.com/krakenjs/swaggerize-hapi) - Design-driven RESTful apis with swagger and hapi from [@PayPalDev](https://twitter.com/PayPalDev).
 - [generator-swaggerize](https://github.com/krakenjs/generator-swaggerize) - Yeoman generator for krakenjs/swaggerize tools from [@PayPalDev](https://twitter.com/PayPalDev).
 - [a127](http://a127.io) - a127 is toolkit for modeling & building rich, enterprise-class APIs in Node.js on your laptop. The focal point of a127 is the Swagger 2.0 specification for defining and describing an API model. From the Swagger model you can generate clients, servers and interactive documentation for your API. From [@apigee](https://github.com/apigee)
+- [ratify](https://github.com/mac-/ratify) - A [Hapi](http://hapijs.com/) plugin that automatically creates Swagger documentation AND validates request/response parameters using the [JSON Schema](http://json-schema.org/) spec.
 
 #### Perl
 - [Raisin](https://github.com/khrt/Raisin) - A framework with a built-in Swagger support.