update readme

README.md

@@ -11,6 +11,8 @@
 * `body-parser`: Node.js body parsing middleware
 * `morgan`: HTTP request logger middleware for node.js
 * `connect-mongodb-session`: MongoDB session store for connect/express built by MongoDB
+* `random`: Seedable random number generator supporting many common distributions.
+* `js-yaml`: YAML 1.2 parser and serializer
 
 ### To use
 * `joi`: Object schema description language and validator for JavaScript objects.