Added missing core devs to AUTHORS file

Author: timlinux

doc/AUTHORS

@@ -44,4 +44,7 @@ Alessandro Furieri	<a.furieri at lqt.it>
 Alexander Bruy	<alexander.bruy@gmail.com>
 Marco Bernasocchi	<marco at bernawebdesign dot ch>
 Nathan Woodrow	<woodrow.nathan at gmail.com>
-Etienne Tourigny  <etourigny.dev at gmail.com>
+Sergey Yakushev	<yakushevs at gmail.com >
+René-Luc D'Hont	<rldhont at gmail.com>
+Etienne Tourigny	<etourigny.dev at gmail.com>
+Larry Schaffer	<larrys at dakotacarto.com>