docs(readme): add Greenkeeper badge
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[![][dependencies-badge]][dependencies-link]
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[![][himawari-badge]][himasaku]
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[![][sakurako-badge]][himasaku]
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[](http://makeapullrequest.com)
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[](http://makeapullrequest.com) [](https://greenkeeper.io/)
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> Lead Maintainer: [syuilo][syuilo-link]
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