AUTHORS: Add past maintainers

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

AUTHORS

 Current Maintainers
 -------------------
 
-* canyonknight <canyonknight@gmail.com>
 * Lukas Fleischer (cryptocrack) <archlinux@cryptocrack.de>
 
+Past Maintainers
+----------------
+
+* canyonknight <canyonknight@gmail.com> (2013-2014)
+* Loui Chang <louipc.ist@gmail.com> (2008-2011)
+* Callan Barrett <wizzomafizzo@gmail.com> (2008-2009)
+* eliott <eliott@cactuswax.net> (2007-2009)
+* Paul Mattal <paul@mattal.com> (2007)
+* Simo Leone <simo@archlinux.org> (2005-2008)
+* Eric Johnson (2004-2005)
+
 Contributors
 ------------