Remove Greenkeeper badge

Author: lukechilds

README.md

@@ -1,7 +1,5 @@
 # this
 
-[![Greenkeeper badge](https://badges.greenkeeper.io/lukechilds/root-module.svg)](https://greenkeeper.io/)
-
 > Traverses up the directory tree and returns the first module found
 
 [![Build Status](https://travis-ci.org/lukechilds/this.svg?branch=master)](https://travis-ci.org/lukechilds/this)