Update README.md

Author: facetrollex

README.md

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 ![Release](https://img.shields.io/github/release/facetrollex/fctrlx-angular-file-reader.svg?style=plastic)
 ![Size](https://img.shields.io/bundlephobia/min/fctrlx-angular-file-reader.svg?style=plastic)
+![Stars](https://img.shields.io/github/stars/facetrollex/fctrlx-angular-file-reader.svg?style=plastic)
 
 # Fctrlx Angular File Reader
 Angular library that helps convert file (from input[type=file]) to base64/arrayBuffer/text using FileReader API.