Commit 0925ce4(Add map_user() and clear_mailmap() to mailmap) broke the
lower-casing of email addresses. This mostly did not matter if your
.mailmap has only lower-case email addresses; However, we did not
require .mailmap to contain lowercase-only email addresses.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>