docs(readme): add Greenkeeper badge

https://greenkeeper.io/
noahw3 · Jan 20, 2017 · 8871c63 · 8871c63
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commit 8871c63
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diff --git a/README.md b/README.md
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 # zeromq
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/zeromq/zeromq.js.svg)](https://greenkeeper.io/)
+
 [![codecov](https://codecov.io/gh/zeromq/zeromq.js/branch/master/graph/badge.svg)](https://codecov.io/gh/zeromq/zeromq.js)
 [![](https://img.shields.io/badge/version-latest-blue.svg)](https://github.com/zeromq/zeromq.js)
 [![Build Status](https://travis-ci.org/zeromq/zeromq.js.svg?branch=master)](https://travis-ci.org/zeromq/zeromq.js)