hg: prepare for Mercurial 5.0 changing "exact" arguments In the backward compat wrapper, we use root=None. That might seem a bit risky. But it seems to work for the single use case we have, and the changeset dropped it in Mercurial https://www.mercurial-scm.org/repo/hg/rev/0531dff73d0b hint that this parameter really is unused.

pytest >= 3.3.0, < 3.8
pytest-runner < 4.3
pytest-sugar >= 0.7.0, < 0.10
pytest-benchmark < 3.2
pytest-localserver < 0.5
mock < 2.1
Sphinx < 1.8
WebTest < 2.1