README: bump dbus dep

We should also mention this in NEWS before release. Suggested text:
> DBus policy files are now installed into /usr rather than /etc. Make sure
> your system has dbus = 1.9.18 running before upgrading to this version, or
> override the install path with --with-dbuspolicydir=

diff --git a/README b/README
index 9f5bc93..f7ccac8 100644 (file)
--- a/README
+++ b/README
@@ -142,7 +142,7 @@ REQUIREMENTS:
         dependencies:
 
         util-linux >= v2.27.1 required
-        dbus >= 1.4.0 (strictly speaking optional, but recommended)
+        dbus >= 1.9.18 (strictly speaking optional, but recommended)
         dracut (optional)
         PolicyKit (optional)