[gedit-plugins] Remove MAINTAINERS file, see the *.doap

[Sébastien Wilmet <swilmet src gnome org>]

commit 9a32863e67f396e59c2d453a08c392677cb3845d
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue Sep 3 18:36:04 2019 +0200

    Remove MAINTAINERS file, see the *.doap
    
    The MAINTAINERS file is no longer needed, see:
    https://wiki.gnome.org/MaintainersCorner
    "Is a MAINTAINERS file still needed?
    No, please create [module].doap files instead."
    
    Already done in the gedit repo, so do the same in gedit-plugins.

 MAINTAINERS | 7 -------
 1 file changed, 7 deletions(-)