changed images that didn't load to .jpg

Author: jacie32

sponsor.html

@@ -198,7 +198,7 @@ <h4><a href="#news">Seahorse</a></h4>
 			 </p>
            </div>
 		   	<div class="col-lg-6 pt-4 pt-lg-0">
-				<img src="assets/img/sponsor_tier.png" alt="robosub competition" class="img-fluid">
+				<img src="assets/img/sponsor_tier.jpg" alt="robosub competition" class="img-fluid">
             </div>
         </div>
 
@@ -241,4 +241,4 @@ <h3>Aggie Marine Robotics</h3>
 
 </body>
 
-</html>
+</html>