Update README.md

Author: JeroenDeDauw

README.md

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 [![License](https://poser.pugx.org/professional-wiki/wikibase-export/license)](LICENSE)
 
 [Wikibase] extension for exporting data as simple CSV.
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 [Professional Wiki] created and maintains Wikibase Export. We provide [Wikibase hosting], [Wikibase development], and [Wikibase consulting].
 
 **Table of Contents**