- update to 0.8.7:
  - Fixed bug where upgrading to the head of a branch which is already
    present would fail, only if that head were also the dependency
    of a different branch that is also upgraded, as the revision system
    would see this as trying to go in the wrong direction.   The check
    here has been refined to distinguish between same-branch revisions
    out of order vs. movement along sibling branches.
  - Adjusted the version traversal on downgrade
    such that we can downgrade to a version that is a dependency for
    a version in a different branch, *without* needing to remove that
    dependent version as well.  Previously, the target version would be
    seen as a "merge point" for it's normal up-revision as well as the
    dependency.  This integrates with the changes for :ticket:`377`
    and :ticket:`378` to improve treatment of branches with dependencies
    overall.
  - Fixed bug where a downgrade to a version that is also a dependency
    to a different branch would fail, as the system attempted to treat
    this as an "unmerge" of a merge point, when in fact it doesn't have
    the other side of the merge point available for update.
  - Fixed bug where the "alembic current" command wouldn't show a revision
    as a current head if it were also a dependency of a version in a
    different branch that's also applied.   Extra logic is added to
    extract "implied" versions of different branches from the top-level
    versions listed in the alembic_version table.
  - Fixed bug where a repr() or str() of a Script object would fail
    if the script had multiple dependencies.
  - Fixed bug in autogen where if the DB connection sends the default
    schema as "None", this "None" would be removed from the list of
    schemas to check if include_schemas were set.  This could possibly
    impact using include_schemas with SQLite.

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