correct links in sky theme

They looked a little wonky if you used a G or a Y.

css/theme/sky.css

@@ -54,6 +54,7 @@ body {
  * LINKS
  *********************************************/
 .reveal a:not(.image) {
+  line-height: 1.3em;
   color: #3b759e;
   text-decoration: none;
   -webkit-transition: color .15s ease;