Add README badges [ci skip]

README.md

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 apt Cookbook
 ============
+[![Cookbook Version](http://img.shields.io/cookbook/v/apt.svg)][cookbook]
+[![Build Status](http://img.shields.io/travis/opscode-cookbooks/apt.svg)][travis]
+
+[cookbook]: https://community.opscode.com/cookbooks/apt
+[travis]: http://travis-ci.org/opscode-cookbooks/apt
+
 This cookbook includes recipes to execute apt-get update to ensure the local APT package cache is up to date. There are recipes for managing the apt-cacher-ng caching proxy and proxy clients. It also includes a LWRP for managing APT repositories in /etc/apt/sources.list.d as well as an LWRP for pinning packages via /etc/apt/preferences.d.