- update to 0.22.0:
 - Drop support for Python 3.6, which reached end of life on 2021-12-23
   and is no longer supported by pip as of pip version 22.
   Take advantage of this to reduce bidict's maintenance costs.
 - Use mypy-appeasing explicit re-exports in ``__init__.py``
   (e.g. ``import x as x``)
   so that mypy no longer gives you an implicit re-export error
   if you run it with ``--no-implicit-reexport`` (or ``--strict``)
   against code that imports from :mod:`bidict`.
 - Update the implementations and type annotations of
   :meth:`bidict.BidictBase.keys` and
   :meth:`bidict.BidictBase.values` to make use of the new
   :class:`~bidict.BidictKeysView` type,
   which works a bit better with type checkers.
 - Inverse bidict instances are now computed lazily the first time
   the :attr:`~bidict.BidictBase.inverse` attribute is accessed
   rather than being computed eagerly during initialization.
   (A bidict's backing, inverse, one-way mapping
   is still kept in sync eagerly as any mutations are made,
   to preserve key- and value-uniqueness.)
 - Optimize initializing a bidict with another bidict.
   In a microbenchmark on Python 3.10,
   this now performs over **2x faster**.
 - Optimize updating an empty bidict with another bidict.
   In a microbenchmark on Python 3.10,
   this now performs **60-75% faster**.
 - Optimize :meth:`~bidict.BidictBase.copy`.
   In a microbenchmark on Python 3.10,
   this now performs **10-20x faster**.
 - Optimize rolling back

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