Update new UTM tags for subject7 [deploy site]

Author: manoj9788

site_source_files/themes/selenium/layouts/partials/selenium-level-sponsors.html

@@ -60,7 +60,7 @@ <h2>Selenium Level Sponsors</h2>
         </div>
         <!-- Added: December 17, 2017 -->
         <div class="backer-logo">
-            <a href="https://subject-7.com/?utm_source=SeleniumHQ&utm_medium=referral&utm_campaign=product">
+            <a href="https://www.subject-7.com/?utm_source=SeleniumHQ&utm_medium=referral&utm_campaign=product">
                 <img class="backer-logo" src="{{"images/sponsors/subject7_logo.png" | relURL}}"/>
             </a>
         </div>