Fixed broken event link (#105)

Note: the https: equivalent uses an invalid certificate
diff --git a/www/events/past.cgi b/www/events/past.cgi
index e3c1a0a..beea1da 100755
--- a/www/events/past.cgi
+++ b/www/events/past.cgi
@@ -28,7 +28,7 @@
       helpblock: -> {
         _p do
           _ 'ApacheCon is the official conference of the ASF, and the last '
-          _a 'ApacheCon was in Miami, May 2017!', href: 'http://events.linuxfoundation.org/events/apachecon-north-america/'
+          _a 'ApacheCon was in Miami, May 2017!', href: 'http://events17.linuxfoundation.org/events/apachecon-north-america'
         end 
         _p 'ApacheCon has been going on since before the ASF was born, and includes great events:'
       }