Add falktx to authors

AUTHORS

@@ -1,5 +1,6 @@
 Nedko Arnaudov <nedko@arnaudov.name>
 Nikita Zlobin <cook60020tmp@mail.ru>
+Filipe Alexandre Lopes Coelho <falktx@gmail.com>
 
 This project borrowed code that was written/modified by:
 Bob Ham <rah@bash.sh>

gui/about.c

@@ -42,7 +42,7 @@ void show_about(void)
 {
   GtkWidget * dialog;
   GdkPixbuf * pixbuf;
-  const char * authors[] = {"Nedko Arnaudov", "Nikita Zlobin", NULL};
+  const char * authors[] = {"Nedko Arnaudov", "Nikita Zlobin", "Filipe Alexandre Lopes Coelho", NULL};
   const char * artists[] = {"Lapo Calamandrei", "Nadejda Pancheva-Arnaudova", NULL};
   char * license;
   struct stat st;