1.6.0 (2021-03-22)
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* Added support for async special methods (``__aiter__``, ``__anext__``,
``__await__``, ``__aenter__``, ``__aexit__``).
These are used in the ``async for``, ``await` and ``async with`` statements.
Note that ``__await__`` returns a wrapper that tries to emulate the crazy
stuff going on in the ceval loop, so there will be a small performance overhead.
* Added the ``__resolved__`` property. You can use it to check if the factory has
been called.
11c44c50e9