docs(readme): add Greenkeeper badge

https://greenkeeper.io/
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 # Pelias API Server

+[![Greenkeeper badge](https://badges.greenkeeper.io/pelias/api.svg)](https://greenkeeper.io/)
+
 This is the API server for the Pelias project. It's the service that runs to process user HTTP requests and return results as GeoJSON by querying Elasticsearch.

 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/pelias/api?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)