Aiohttp-wsgi

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- Removed ``loop`` argument from :class:`WSGIHandler` constructor.
- Fixed tests to work with aiohttp 3.8.1+.

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- **Bugfix:** Added in ``py.typed`` PEP 561 marker file.

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- Added PEP 484 / PEP 561 type annotations.
- **Bugfix:** Fixed crash when running with ``PYTHONOPTIMIZE=2``.

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- Added support for ``aiohttp >= 3.4`` (michael-k).

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- Added ``static_cors`` argument to :func:`serve()`, allowing CORS to be configured for static files.
- Added ``--static-cors`` argument to :doc:`aiohttp-wsgi-serve <main>` command line interface.

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- Added new :func:`serve()` helper for simple WSGI applications that don't need :ref:`websockets <aiohttp-web-websockets>` or :ref:`async request handlers <aiohttp-web-handler>` (etianen).
- Updated :mod:`aiohttp` dependency to ``>=3`` (etianen).
- Improved error message for invalid hop-by-hop headers (chriskuehl).
- **Breaking:** Dropped support for Python 3.4 (etianen).