[gnome-todo] Add a "todo" keyword to the desktop file.

[Jehan Pagès <jehanp src gnome org>]

commit b3207b71f783d9de7d3e4991d99e01c2ff4ab731
Author: Jehan <jehan girinstud io>
Date:   Sat Nov 19 14:45:42 2016 +0100

    Add a "todo" keyword to the desktop file.
    
    "Todo" is a common keyword to describe a task management software, but
    the software is called "To do" with the 2 original words split. Which is
    fine except that it means that searching "todo" does not always return
    "GNOME To Do". In particular, it won't work in the software center. It
    does work in GNOME Shell, yet only as a side effect of the executable
    being called `gnome-todo`. But then it will fail when packaged as
    Flatpak which replaces the Exec value.

 data/org.gnome.Todo.desktop.in.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.Todo.desktop.in.in b/data/org.gnome.Todo.desktop.in.in
index a46542c..3f54683 100644
--- a/data/org.gnome.Todo.desktop.in.in
+++ b/data/org.gnome.Todo.desktop.in.in
@@ -8,5 +8,5 @@ Type=Application
 StartupNotify=true
 OnlyShowIn=GNOME;
 Categories=GNOME;GTK;Utility;
-_Keywords=Task;Productivity;
+_Keywords=Task;Productivity;Todo;
 DBusActivatable=true