compat: drop support for Mercurial 4.2
Since Mercurial 4.6 is about to be released, we drop support for 4.2 too.
(code still need to be cleaned up).
# define Mercurial extension metadata for evolution
#
# Copyright 2017 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
__version__ = '8.0.0.dev'
testedwith = '4.3.2 4.4.2 4.5.2'
minimumhgversion = '4.3'
buglink = 'https://bz.mercurial-scm.org/'