Adds Julien Poissonnier to AUTHORS

AUTHORS

@@ -55,6 +55,7 @@ Jonatan Heyman <jonatan@heyman.info>
 Joshua Ginsberg <jag@flowtheory.net>
 Juan Ignacio Catalano <catalanojuan@gmail.com>
 Juarez Bochi <jbochi@gmail.com>
+Julien Poissonnier <julien@caffeine.lu>
 Kevin Tran <hekevintran@gmail.com>
 Kornelijus Survila <kornholijo@gmail.com>
 Leo Dirac <leo@banyanbranch.com>