Update README.md

Author: RemiixInc

README.md

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 # screenshot
 📸 Serverless API to take screenshots of websites with Puppeteer.
 
+**Deploy your own screenshot API for free:**
+
 [![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/git/external?repository-url=https%3A%2F%2Fgithub.com%2FRemiixInc%2Fscreenshot)