Add fkm3 to AUTHORS

AUTHORS

@@ -15,6 +15,7 @@ Aaron Hopkins <go-sql-driver at die.net>
 Arne Hormann <arnehormann at gmail.com>
 Carlos Nieto <jose.carlos at menteslibres.net>
 DisposaBoy <disposaboy at dby.me>
+Frederick Mayle <frederickmayle at gmail.com>
 Hanno Braun <mail at hannobraun.com>
 James Harr <james.harr at gmail.com>
 Jian Zhen <zhenjl at gmail.com>