docs(readme): add Greenkeeper badge

https://greenkeeper.io/
remarkjs · Feb 23, 2017 · 9d40988 · 9d40988
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diff --git a/README.md b/README.md
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 # remark-textr
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/denysdovhan/remark-textr.svg)](https://greenkeeper.io/)
+
 [![NPM version][npm-image]][npm-url]
 [![Build Status][travis-image]][travis-url]
 [![Coveralls Status][coveralls-image]][coveralls-url]