docs(readme): add Greenkeeper badge

GeKorm · Mar 1, 2018 · f7f8017 · f7f8017
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 gulp-zopfli-green
 ===========
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/GeKorm/gulp-zopfli-green.svg)](https://greenkeeper.io/)
+
 This is a fork of gulp-zopfli that aims to keep all dependencies updated.
 
 A [Zopfli](http://en.wikipedia.org/wiki/Zopfli) plugin for [gulp](https://github.com/wearefractal/gulp),