Update targeted organic traffic URL

Author: GuillaumeGomez

index.md

@@ -76,7 +76,7 @@ Thanks to everyone supporting us on [open collective][opencollective]! A list of
         </a>
     </li>
     <li>
-        <a href="https://opencollective.com/targeted-organic-traffic">
+        <a href="https://www.targetedwebtraffic.com/buy/buy-targeted-organic-traffic-keyword-targeted-google-organic-traffic/">
             <img alt="Targeted Organic Traffic" src="/images/targeted-organic-traffic.png">
             <div>Targeted Organic Traffic</div>
             <div class="metal bronze">Bronze Sponsor</div>