.arcconfig

py3: make sure we open files in bytes mode

we internally deal with bytes and should read files in bytes mode.

Differential Revision: https://phab.mercurial-scm.org/D3606

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