[gnome-todo] README: Fix broken 'Getting Involved' links

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 788a04d542e8565eb6acdacaa482eafd3d9a7598
Author: 8F3E <39588555+8F3E users noreply github com>
Date:   Wed Jun 6 18:45:33 2018 +0100

    README: Fix broken 'Getting Involved' links
    
    The current links in the 'Getting Involved' section of the README for 'Contributions Guidelines' and 
'Code Style Guidelines' returned 404s.
    
    Found the files under the 'doc' folder, and rectified the links to read 
https://gitlab.gnome.org/GNOME/gnome-todo/blob/master/doc/*
    
    Closes gitlab issue https://gitlab.gnome.org/GNOME/gnome-todo/issues/188

 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README.md b/README.md
index 4ae40ee..53c29bf 100644
--- a/README.md
+++ b/README.md
@@ -38,8 +38,8 @@ respectful and kind.
 Stop by and say hello!
 
 
-[code-style]: https://gitlab.gnome.org/GNOME/gnome-todo/blob/master/HACKING.md
-[contribution-guidelines]: https://gitlab.gnome.org/GNOME/gnome-todo/blob/master/CONTRIBUTING.md
+[code-style]: https://gitlab.gnome.org/GNOME/gnome-todo/blob/master/doc/HACKING.md
+[contribution-guidelines]: https://gitlab.gnome.org/GNOME/gnome-todo/blob/master/doc/CONTRIBUTING.md
 [gitlab]: https://gitlab.gnome.org/GNOME/gnome-todo
 [irc-channel]: irc://irc.gnome.org/gnome-todo
 [irc-wiki-page]: https://wiki.gnome.org/Community/GettingInTouch/IRC