docs(readme): add Greenkeeper badge

https://greenkeeper.io/
magicdawn · Apr 8, 2017 · 3d223d8 · 3d223d8
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 # promise.retry
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+[![Greenkeeper badge](https://badges.greenkeeper.io/magicdawn/promise.retry.svg)](https://greenkeeper.io/)
 > add (timeout and fail) retry for async functions
 
 [![Build Status](https://img.shields.io/travis/magicdawn/promise.retry.svg?style=flat-square)](https://travis-ci.org/magicdawn/promise.retry)