Update README.md

Switch to shields.io for the badges and add a GitHub release one too.

[ci skip]

README.md

@@ -1,4 +1,7 @@
-# Ratchet v2.0.2 [![Build Status](https://secure.travis-ci.org/twbs/ratchet.svg?branch=master)](http://travis-ci.org/twbs/ratchet) [![devDependencies](https://david-dm.org/twbs/ratchet/dev-status.svg?theme=shields.io)](https://david-dm.org/twbs/ratchet#info=devDependencies)
+# [Ratchet](http://goratchet.com)
+[![GitHub Release](https://img.shields.io/github/release/twbs/ratchet.svg)](https://github.com/twbs/ratchet/releases)
+[![Build Status](https://img.shields.io/travis/twbs/ratchet/master.svg)](https://travis-ci.org/twbs/ratchet)
+[![devDependency Status](https://img.shields.io/david/dev/twbs/ratchet.svg)](https://david-dm.org/twbs/ratchet#info=devDependencies)
 
 Build mobile apps with simple HTML, CSS, and JS components.