[simple-scan] Remove unnecessary detail about gconf

[Robert Ancell <rancell src gnome org>]

commit ebb2aa31466fae622faec80a0ddd7b1459bec9d6
Author: Robert Ancell <robert ancell canonical com>
Date:   Thu Dec 7 09:22:42 2017 +1300

    Remove unnecessary detail about gconf

 README.md | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/README.md b/README.md
index 79f724c..cda0553 100644
--- a/README.md
+++ b/README.md
@@ -31,9 +31,6 @@ There is a --debug command line switch to enable more verbose logging:
 
 Log messages can also be found in the $HOME/.cache/simple-scan folder.
 
-Simple Scan config goes to $HOME/.gconf/apps/simple-scan/%gconf.xml
-and that file is best edited with the gconf-editor tool.
-
 If you don't have a scanner ready, you can use a virtual "test" scanner:
 ```
 ./install/bin/simple-scan --debug test