Add previous Stockholm event

Author: JoelBesada

index.html

@@ -108,7 +108,7 @@ <h2>The rules</h2>
 
     <div class="part">
       <h2>Previous official events</h2>
-      <p>Singapore &middot; November 2016</p>
+      <p>Stockholm &middot; September 2016</p>
       <p>Stockholm &middot; October 2015</p>
       <p>Stockholm &middot; March 2015</p>
       <p>New York &middot; October 2014</p>