git: openjdk/skara: Add Mercurial mapping for skara command

[duke]

Changeset: 409464dd
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2019-09-11 13:34:41 +0000
URL:       https://github.com/openjdk/skara/commit/409464dd

Add Mercurial mapping for skara command

Reviewed-by: rwestberg

! skara.py