docs(readme): add Greenkeeper badge

stevenvachon · Jun 29, 2017 · ab651fd · ab651fd
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commit ab651fd
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diff --git a/README.md b/README.md
@@ -1,5 +1,7 @@
 # urlcache [![NPM Version][npm-image]][npm-url] ![File Size][filesize-image] [![Build Status][travis-image]][travis-url] [![Coverage Status][coveralls-image]][coveralls-url] [![Dependency Status][david-image]][david-url]
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/stevenvachon/urlcache.svg)](https://greenkeeper.io/)
+
 > Normalized URL key-value cache.