py3: add b'' prefixes in hgext/convert/subversion.py
Litrerals starting with triple quotes or prepended with r'' do not get
prepended by b'' by the transformer.
# skip-blame because just adding b'' prefixes
Differential Revision: https://phab.mercurial-scm.org/D3592
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}