Update index.html

Author: RemiixInc

index.html

@@ -20,7 +20,7 @@ <h1>Screenshot API &nbsp;&#128248;</h1>
       <h4 style="font-weight: normal;">Serverless API to take screenshots of websites with Puppeteer.</h4>
     </header>
     <h3>Example</h3>
-    <p><a href="https://s.vercel.app/api?url=https://google.com&amp;width=1280&amp;height=720">s.vercel.app/api?url=https://google.com&amp;width=1280&amp;height=720</a></p>
+    <p><a href="https://s.vercel.app/api?url=https://google.com&amp;width=1280&amp;height=720">https://s.vercel.app/api?url=https://google.com&amp;width=1280&amp;height=720</a></p>
     <br>
     <p><b>Deploy your own screenshot API for free:</b></p>
     <p><a href="https://vercel.com/new/git/external?repository-url=https%3A%2F%2Fgithub.com%2FRemiixInc%2Fscreenshot"><img src="https://vercel.com/button" alt="Deploy with Vercel"></a></p>