[gnome-themes-extra] Rename LICENSE back to COPYING

[Juraj Fiala <jurf src gnome org>]

commit 5f39e5b919f27770f54863c9069843f16aab88c2
Author: Juraj Fiala <jurf riseup net>
Date:   Wed Feb 14 21:07:58 2018 +0100

    Rename LICENSE back to COPYING
    
    Autotools automatically only includes COPYING files, but not LICENSE
    ones in tarballs. Hence, we stopped shipping the LICENSE.
    
    Fixes #15.

 LICENSE => COPYING | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
---
diff --git a/LICENSE b/COPYING
similarity index 100%
rename from LICENSE
rename to COPYING