Add Nikita to AUTHORS and the gladish about dialog

AUTHORS

@@ -1,4 +1,5 @@
 Nedko Arnaudov <nedko@arnaudov.name>
+Nikita Zlobin <cook60020tmp@mail.ru>
 
 This project borrowed code that was written/modified by:
 Bob Ham <rah@bash.sh>

gui/about.c

@@ -78,7 +78,7 @@ void show_about(void)
 {
   GtkWidget * dialog;
   GdkPixbuf * pixbuf;
-  const char * authors[] = {"Nedko Arnaudov", NULL};
+  const char * authors[] = {"Nedko Arnaudov", "Nikita Zlobin", NULL};
   const char * artists[] = {"Lapo Calamandrei", "Nadejda Pancheva-Arnaudova", NULL};
   char * license;