py-mercurial: update to 4.3.3.

Mercurial 4.3.3 (2017-10-01)

    Prevent crashes when clearing progress bar. (issue5684)

    rebase: move bookmarks with --keep (issue5682)

Mercurial 4.3.2 (2017-09-18)

    restore compatibility with older versions of Python 2.7 by not using a bytearray with struct.unpack_from()
    restore mingw compatibility for setup.py
    hgwebdir: read 'web.template' untrusted (plugs potential security issue)

    repair: preserve phase when not using generaldelta (issue5678)
    ssh: fix flakey ssh errors on BSD systems

    restore error handling behavior around certain I/O errors; the
    regressed behavior could result in transactions not being
    properly rolled back if stdio handles encountered errors
    (issue5658)

    templatekw: choose {latesttag} by len(changes), not date (issue5659)

    record: fix revert -i for lines without newline (issue5651)
    mq: create non-lossy patches, also with custom global diff configuration

(wiz)