Adds Seong Won Mun to AUTHORS

AUTHORS

@@ -93,6 +93,7 @@ Ryan Petrello <lists@ryanpetrello.com>
 Sam Cooke <sam@mixcloud.com>
 Sean Creeley <sean.creeley@gmail.com>
 Sean O'Connor <sean@seanoc.com>
+Seong Won Mun <longfinfunnel@gmail.com>
 Simon Josi <simon.josi@atizo.com>
 Steeve Morin <steeve.morin@gmail.com>
 Stefan Kjartansson <esteban.supreme@gmail.com>