Log Message:
Update to 2.0.21. Mark as not ready for python-3.x.

Changes in 2.0.21

    Now that AnkiDroid has been updated, buried cards will now only
    be automatically unburied when a new day rolls over, and not
    when you sync or restart Anki. If you sync from this version
    to AnkiWeb and then to the mobile clients, they should also
    switch over to this new behaviour.

    New users will now need to confirm their choice of interface
    language before proceeding.

    Increase filtered deck max size to 99999

    Fix drag&drop of Google images from Safari

    Ignore filtered cards when determining min/max in reposition
    dialog

    When a corrupt collection is found, rename it so the profile
    can be loaded again and restored from backup.

    Fix a regression in displaying startup errors and quitting from
    the profile manager

    Display a better error message when a sync times out

    Fix an error caused by an add-on that changes browser columns

    Fix a bug where the forward & optional reverse note type was
    invalid when added in languages other than English.

    If the same word has been cloze-deleted multiple times in a
    cloze, only require it to be typed once in the type in the
    answer feature.