paperjs improvement

index.html

@@ -59,9 +59,9 @@
       </div>
     </article>
 
-    <script src="article.js"></script>
-  
-    <!-- referral tracking, because I like knowing who's linking to my book -->  
+    <script src="article.js" async></script>
+
+    <!-- referral tracking, because I like knowing who's linking to my book -->
     <script src="lib/site/referrer.js" async></script>
   </body>
 </html>