docs(readme): add Greenkeeper badge

https://greenkeeper.io/
magicdawn · Apr 8, 2017 · f14f058 · f14f058
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 # ractive-engine
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+[![Greenkeeper badge](https://badges.greenkeeper.io/magicdawn/ractive-engine.svg)](https://greenkeeper.io/)
 Template engine for node.js with Ractive.js.
 
 [![Build Status](https://travis-ci.org/magicdawn/ractive-engine.svg?branch=master)](https://travis-ci.org/magicdawn/ractive-engine)