- update to 1.8.1:
  * Fixed bug where the SQLite implementation of
    :meth:`.Operations.rename_table` would render an explicit schema name for
    both the old and new table name, which while is the standard ALTER syntax,
     is not accepted by SQLite's syntax which doesn't support a rename across
    schemas. In particular, the syntax issue would prevent batch mode from
    working for SQLite databases that made use of attached databases (which are
    treated as "schemas" in SQLAlchemy).
  * Added an error raise for the condition where
    :meth:`.Operations.batch_alter_table` is used in ``--sql`` mode, where the
    operation requires table reflection, as is the case when running against
    SQLite without giving it a fixed ``Table`` object. Previously the operation
    would fail with an internal error.   To get a "move and copy" batch
    operation as a SQL script without connecting to a database,
    a ``Table`` object should be passed to the
    :paramref:`.Operations.batch_alter_table.copy_from` parameter so that
    reflection may be skipped.

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