Update authors

AUTHORS

@@ -52,6 +52,7 @@ or just made Pipeline more awesome.
  * Evan Myller <eMyller@7ws.co>
  * Fabian Büchler <fabian.buechler@gmail.com>
  * Feanil Patel <feanil@edx.org>
+ * Felix Last <mail@felixlast.de>
  * Florent Messa <florent.messa@gmail.com>
  * Frankie Dintino <fdintino@theatlantic.com>
  * Hannes Ljungberg <hannes.ljungberg@gmail.com>