Now that Unicode 12.1 has been announced[0], update the character
width tables to the new version.
[0] http://blog.unicode.org/2019/05/unicode-12-1-en.html
Signed-off-by: Beat Bolli <dev+git@drbeat.li>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This is more consistent with the project style. The majority of Git's
source files use dashes in preference to underscores in their file names.
Also adjust contrib/update-unicode as well.
Signed-off-by: Stefan Beller <sbeller@google.com>