message: Update README.md
  move GK badge
diff: LevelDOWN
  =========
  -[![Greenkeeper badge](https://badges.greenkeeper.io/Level/leveldown.svg)](https://greenkeeper.io/)
  -
  <img alt="LevelDB Logo" height="100" src="http://leveldb.org/img/logo.svg">
  **A Low-level Node.js LevelDB binding**
  [![Build Status](https://secure.travis-ci.org/Level/leveldown.png)](http://travis-ci.org/Level/leveldown)
  [![AppVeyor build status](https://img.shields.io/appveyor/ci/Level/leveldown.svg)](https://ci.appveyor.com/project/Level/leveldown)
  -[![dependencies](https://david-dm.org/Level/leveldown.svg)](https://david-dm.org/level/leveldown)
  +[![dependencies](https://david-dm.org/Level/leveldown.svg)](https://david-dm.org/level/leveldown) [![Greenkeeper badge](https://badges.greenkeeper.io/Level/leveldown.svg)](https://greenkeeper.io/)
  [![NPM](https://nodei.co/npm/leveldown.png?stars&downloads&downloadRank)](https://nodei.co/npm/leveldown/) [![NPM](https://nodei.co/npm-dl/leveldown.png?months=6&height=3)](https://nodei.co/npm/leveldown/)
  