bash: offer refs instead of filenames for 'git revert'
The completion script for 'git revert' currently offers options and filenames. However, 'git revert' doesn't take any filenames from the command line, but a single commit. Therefore, it's more sane to offer refs instead.
Signed-off-by: SZEDER Gábor <firstname.lastname@example.org> Acked-by: Shawn O. Pearce <email@example.com> Signed-off-by: Junio C Hamano <firstname.lastname@example.org>