add more space between speakers

Author: stevestmartin

themes/gophercon/static/2016/css/theme-gophercon.css

@@ -1311,7 +1311,7 @@ nav .container {
 }
 .speaker-with-bio {
   overflow: hidden;
-  margin-bottom: 36px;
+  margin-bottom: 72px;
 }
 
 .speaker-description span {