chore: update opencollective sponsors

Author: vkarpov15

index.pug

@@ -401,6 +401,9 @@ html(lang='en')
               <a rel="sponsored" href="https://casino.guide/crypto-casinos/">
                 <img class="sponsor" src="https://casino.guide/wp-content/themes/casinoguide/assets/lotti/en/default/images/img_0.png" style="height: 100px">
               </a>
+              <a rel="sponsored" href="https://opencollective.com/seo-pmi">
+                <img class="sponsor" src="https://images.opencollective.com/seo-pmi/avatar/256.png" style="height: 100px">
+              </a>
             </div>
           </div>