docs(readme): add Greenkeeper badge

https://greenkeeper.io/
magicdawn · Apr 8, 2017 · 1a7ff41 · 1a7ff41
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 # promise.map
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/magicdawn/promise.map.svg)](https://greenkeeper.io/)
 > Promise.map in Bluebird
 
 [![Build Status](https://img.shields.io/travis/magicdawn/promise.map.svg?style=flat-square)](https://travis-ci.org/magicdawn/promise.map)