docs(readme): add Greenkeeper badge

Kikobeats · Jul 17, 2017 · 6eaf8ea · 6eaf8ea
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 <h4 align="center">A JavaScript optimization handbook from a high level point of view.</h4>
 
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+[![Greenkeeper badge](https://badges.greenkeeper.io/Kikobeats/js-mythbusters.svg)](https://greenkeeper.io/)