devel/hg-git: update 0.6.1 -> 0.7.0

PR:		194901
Submitted by:	Marco Broder <marco.broeder@posteo.eu>
Approved by:	mentors (implicit)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@372717 35697150-7ecd-e111-bb59-0022644237b5