Update readme.md

Author: brauliodiez

readme.md

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 # react-promise-tracker
 
-Simple promise tracker React Hoc.[Live Demo]:(https://stackblitz.com/edit/react-promise-tracker-default-area-sample)
+Simple promise tracker React Hoc. You can see it in action: [Live Demo](https://stackblitz.com/edit/react-promise-tracker-default-area-sample)
 
 # Why do I need this?