Update README.md

Author: Cedric Franke

README.md

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 # automatic-slidershow-webcomponent
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+[![Published on npm](https://img.shields.io/npm/v/@node-projects/automatic-slidershow-webcomponent.svg?logo=npm)](https://www.npmjs.com/package/@node-projects/automatic-slidershow-webcomponent)
 
 # description
 a simple slider show as webcomponent..