fixed hechtl affiliation

Author: juelg

index.html

@@ -71,7 +71,7 @@ <h1 class="title">
               <span class="author-block">
                 Ken Nakahara<sup>2</sup>,</span>
               <span class="author-block">
-                Johannes Hechtl<sup>3</sup>,</span>
+                Johannes Hechtl<sup>1,3</sup>,</span>
               <span class="author-block">
                 Roberto Calandra<sup>2</sup>,</span>
               <span class="author-block">