docs(readme): add Greenkeeper badge

https://greenkeeper.io/
greenkeeperio · Feb 17, 2017 · 5357f22 · 5357f22
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 # greenkeeper-shrinkwrap
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/greenkeeperio/greenkeeper-shrinkwrap.svg)](https://greenkeeper.io/)
+
 > Enabling shrinkwrap support for Greenkeeper via Travis CI
 
 [![Build Status](https://travis-ci.org/greenkeeperio/greenkeeper-shrinkwrap.svg?branch=master)](https://travis-ci.org/greenkeeperio/greenkeeper-shrinkwrap)