Fixed typo in pandoc template

default.revealjs

@@ -17,7 +17,7 @@ $endif$
   <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
   <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
   <link rel="stylesheet" href="$revealjs-url$/css/reveal.css">
-  <link rel="stylesheet" href="css/custome.css">
+  <link rel="stylesheet" href="css/custom.css">
   <style type="text/css">code{white-space: pre;}</style>
 $if(quotes)$
   <style type="text/css">q { quotes: "“" "”" "‘" "’"; }</style>