Pytest-asyncio

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- Add support for Python 3.9
- Abandon support for Python 3.5. If you still require support for Python 3.5, please use pytest-asyncio v0.14 or earlier.
- Set ``unused_tcp_port_factory`` fixture scope to 'session'.
`163 <https://github.com/pytest-dev/pytest-asyncio/pull/163>`_
- Properly close event loops when replacing them.
`208 <https://github.com/pytest-dev/pytest-asyncio/issues/208>`_

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- Fix `162 <https://github.com/pytest-dev/pytest-asyncio/issues/162>`_, and ``event_loop`` fixture behavior now is coherent on all scopes.
`164 <https://github.com/pytest-dev/pytest-asyncio/pull/164>`_

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- Run the event loop fixture as soon as possible. This helps with fixtures that have an implicit dependency on the event loop.
`156 <https://github.com/pytest-dev/pytest-asyncio/pull/156>`_

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- Test on 3.8, drop 3.3 and 3.4. Stick to 0.10 for these versions.
`152 <https://github.com/pytest-dev/pytest-asyncio/pull/152>`_
- Use the new Pytest 5.4.0 Function API. We therefore depend on pytest >= 5.4.0.
`142 <https://github.com/pytest-dev/pytest-asyncio/pull/142>`_
- Better ``pytest.skip`` support.
`126 <https://github.com/pytest-dev/pytest-asyncio/pull/126>`_

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- ``pytest-asyncio`` integrates with `Hypothesis <https://hypothesis.readthedocs.io>`_
to support ``given`` on async test functions using ``asyncio``.
`102 <https://github.com/pytest-dev/pytest-asyncio/pull/102>`_
- Pytest 4.1 support.
`105 <https://github.com/pytest-dev/pytest-asyncio/pull/105>`_

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- Python 3.7 support.
- Remove ``event_loop_process_pool`` fixture and
``pytest.mark.asyncio_process_pool`` marker (see
https://bugs.python.org/issue34075 for deprecation and removal details)