docs(readme): add Greenkeeper badge

https://greenkeeper.io/
zerolethanh · Apr 1, 2017 · 29b0ee1 · 29b0ee1
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 # PhotoShare
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+[![Greenkeeper badge](https://badges.greenkeeper.io/zerolethanh/PhotoShare.svg)](https://greenkeeper.io/)
 @2015 - IE4A2班 - 卒制
 https://photoshare.space