Update footer.html

Author: ArturT

_includes/footer.html

@@ -35,7 +35,7 @@ <h2 class="footer-heading">{{ site.title }}</h2>
         <a class="cky-banner-element footer-link-secondary cursor-pointer">Cookie Settings</a>
       </p>
       <p>
-        &copy; 2015 - {{ site.time | date: '%Y' }} <a href="{{ site.knapsack_pro_url }}">KnapsackPro.com</a>
+        &copy; 2015 - {{ site.time | date: '%Y' }} <a href="{{ site.knapsack_pro_url }}" rel="nofollow noopener noreferrer" target="_blank">KnapsackPro.com</a>
       </p>
     </div>