Aiohttp

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- Close a connection if an unexpected exception occurs while sending a request
(`2827 <https://github.com/aio-libs/aiohttp/pull/2827>`_)

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- Use ``asyncio.current_task()`` on Python 3.7 (`2825 <https://github.com/aio-libs/aiohttp/pull/2825>`_)

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- Fix SSL proxy support by client. (`2810 <https://github.com/aio-libs/aiohttp/pull/2810>`_)
- Restore an imperative check in ``setup.py`` for python version. The check
works in parallel to environment marker. As effect an error about unsupported
Python versions is raised even on outdated systems with very old
``setuptools`` version installed. (`2813 <https://github.com/aio-libs/aiohttp/pull/2813>`_)

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- Add ``_reuse_address`` and ``_reuse_port`` to
``web_runner.TCPSite.__slots__``. (`2792 <https://github.com/aio-libs/aiohttp/pull/2792>`_)

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- Fix ``InvalidStateError`` on processing a sequence of two
``RequestHandler.data_received`` calls on web server. (`2773 <https://github.com/aio-libs/aiohttp/pull/2773>`_)

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- Fix ``IndexError`` in HTTP request handling by server. (`2752 <https://github.com/aio-libs/aiohttp/pull/2752>`_)
- Fix MultipartWriter.append* no longer returning part/payload. (`2759 <https://github.com/aio-libs/aiohttp/pull/2759>`_)