manual: Replace readline link.

The old URL no longer works (error 504: host unreachable). The new
gnu.org will hopefully stay.

Suggested-by: checklink(1)

diff --git a/web/manual.md b/web/manual.md
index ed880d897d060770632294095247503d77b412d2..d24563f65a036807b441e9c61110176887e8383d 100644 (file)
--- a/web/manual.md
+++ b/web/manual.md
@@ -385,7 +385,7 @@ the ao writer (ESD, PulseAudio,...).  Debian package: `libao-dev`.
 para_gui. Debian package: `libncurses-dev`.
 
 - [GNU
-Readline](http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html). If
+Readline](https://www.gnu.org/software/readline/). If
 this library (`libreadline-dev`) is installed, para_client, para_audioc
 and para_play support interactive sessions.