.arcconfig

py3: open patch file in binary mode and convert eol manually

Here we don't introduce a reader wrapper since it wouldn't be easy to make
read(n) handle partial data and length correctly.

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