[4.0] a8d7884 Readline does not belong on this list.

[Lasse Karstensen]

commit a8d788465705259431177c3bd3de8a36a1d40e35
Author: Lasse Karstensen <lkarsten at varnish-software.com>
Date:   Wed Jul 9 15:12:29 2014 +0200

    Readline does not belong on this list.
    
    This reflects the debian build files, editline will suffice.

diff --git a/doc/sphinx/installation/install.rst b/doc/sphinx/installation/install.rst
index d93e2b5..bbae1e6 100644
--- a/doc/sphinx/installation/install.rst
+++ b/doc/sphinx/installation/install.rst
@@ -84,7 +84,6 @@ installed. On a Debian or Ubuntu system these are:
 * `libjemalloc-dev`
 * `libncurses-dev`
 * `libpcre3-dev`
-* `libreadline-dev`
 * `libtool`
 * `pkg-config`
 * `python-docutils`