.arcconfig

py3: add b'' to some run-tests.py strings for Windows

Things go seriously off the rails after this, so there may be more that are
missing.

# skip-blame since these are just converting to bytes literals

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}