docs(readme): add Greenkeeper badge (#73)

https://greenkeeper.io/
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greenkeeper[bot] 2017-02-15 18:34:47 +01:00 committed by Luke Page
parent e3bef7d1a6
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pngjs
========
[![Greenkeeper badge](https://badges.greenkeeper.io/lukeapage/pngjs.svg)](https://greenkeeper.io/)
Simple PNG encoder/decoder for Node.js with no dependencies.
Based on the original [pngjs](https://github.com/niegowski/node-pngjs) with the follow enhancements.