Add self to authors

As referred by @Zariel

AUTHORS

@@ -57,3 +57,4 @@ Adrien Bustany <adrien@bustany.org>
 Andrey Smirnov <smirnov.andrey@gmail.com>
 Adam Weiner <adamsweiner@gmail.com>
 Daniel Cannon <daniel@danielcannon.co.uk>
+Johnny Bergström <johnny@joonix.se>