[gedit-plugins] Remove AUTHORS file

[Sébastien Wilmet <swilmet src gnome org>]

commit fb4a87a431cfe418f9ee59a3087302625207f698
Author: Sébastien Wilmet <swilmet informatique-libre be>
Date:   Sun Jul 17 23:31:34 2022 +0200

    Remove AUTHORS file
    
    git shortlog -sn is your friend and is more accurate.
    Also the *.doap file has the list of maintainers, and doing a git log -p
    on that file shows its history.

 AUTHORS | 4 ----
 1 file changed, 4 deletions(-)