Replace broken DavidDM badges with Greenkeeper

README.md

@@ -1,12 +1,9 @@
 ## scratch-vm
 #### Scratch VM is a library for representing, running, and maintaining the state of computer programs written using [Scratch Blocks](https://github.com/LLK/scratch-blocks).
 
-[![Greenkeeper badge](https://badges.greenkeeper.io/LLK/scratch-vm.svg)](https://greenkeeper.io/)
-
 [![Build Status](https://travis-ci.org/LLK/scratch-vm.svg?branch=develop)](https://travis-ci.org/LLK/scratch-vm)
 [![Coverage Status](https://coveralls.io/repos/github/LLK/scratch-vm/badge.svg?branch=develop)](https://coveralls.io/github/LLK/scratch-vm?branch=develop)
-[![Dependency Status](https://david-dm.org/LLK/scratch-vm.svg)](https://david-dm.org/LLK/scratch-vm)
-[![devDependency Status](https://david-dm.org/LLK/scratch-vm/dev-status.svg)](https://david-dm.org/LLK/scratch-vm#info=devDependencies)
+[![Greenkeeper badge](https://badges.greenkeeper.io/LLK/scratch-vm.svg)](https://greenkeeper.io/)
 
 ## Installation
 This requires you to have Git and Node.js installed.