- update to 1.13.1:
  * Fixed :class:`.Rewriter` so that more than two instances
    could be chained together correctly, also allowing multiple
    ``process_revision_directives`` callables to be chained.
  * Fixed issue where the method
    :meth:`.EnvironmentContext.get_x_argument` using the
    :paramref:`.EnvironmentContext.get_x_argument.as_dictionary`
    parameter would fail if an argument key were passed on the
    command line as a name alone, that is, without an equal sign
    ``=`` or a value. Behavior is repaired where this condition is
    detected and will return a blank string for the given key,
    consistent with the behavior where the ``=`` sign is
    present and no value.
  * Fixed issue where the "unique" flag of an ``Index`` would not
    be maintained when generating downgrade migrations.
  * Fixed bug in versioning model where a downgrade across a
    revision with two down revisions with one down revision
    depending on the other, would produce an erroneous state in
    the alembic_version table, making upgrades impossible
    without manually repairing the table.
  * Updated pep-484 typing to pass mypy "strict" mode, however
    including per-module qualifications for specific typing
    elements not yet complete.
  * This allows us to catch specific typing issues that have been
    ongoing such as import symbols not properly exported.

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