redirect readline() prompt to stderr (like bash)

useful for testing program.

srcs/init.c

@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/08 09:22:12 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/02 01:32:18 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/12/02 01:38:22 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -18,6 +18,7 @@ static int	init_readline_hook(void);
 int	init(t_all *c)
 {
 	ft_bzero(c, sizeof (*c));
+	rl_outstream = stderr;
 	rl_startup_hook = init_readline_hook;
 	readline(NULL);
 	rl_startup_hook = NULL;