Add icon attribution

wirecloud-fiware · Dec 28, 2017 · d9357f4 · d9357f4
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 This operator transforms NGSI entities (as the ones coming from the NGSI source operator) using any of the available [data models from FIWARE](https://schema.fiware.org) into Points of Interest. Point of Interest is the format used by many of the map viewers provided in WireCloud (like the `ol3-map` widget).
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+This operator uses icons made by Freepik from www.flaticon.com