Adds Matthew Miller to AUTHORS

AUTHORS

@@ -89,6 +89,7 @@ Martin Galpin <m@66laps.com>
 Martin Melin <git@martinmelin.com>
 Matt Williamson <dawsdesign@gmail.com>
 Matthew J Morrison <mattj.morrison@gmail.com>
+Matthew Miller <matthewgarrettmiller@gmail.com>
 Mauro Rocco <fireantology@gmail.com>
 Maxim Bodyansky <bodyansky@gmail.com>
 Mher Movsisyan <mher.movsisyan@gmail.com>