Mocket

Thanks to amotl for 111 and the related test at https://gist.github.com/amotl/015ef6b336db55128798d7f1a9a67dea

Fix for second `sendall` used for delivering request's body.

Thanks to ajhodges for writing the test which reproduced the issue.

Now the import line can be written as `from mocket.plugins.httpretty import httpretty, httprettified`.

Thanks to jonringer for the contribution.

This version ships the change to support the `libmagic` wrapper distributed with `file`'s command.

With this change, thanks to felixonmars contribution, Mocket is now available as Arch Linux package: https://www.archlinux.org/packages/community/any/python-mocket/

Support for tests based on `unittest.IsolatedAsyncioTestCase` (Python `3.8`). See:
https://github.com/mindflayer/python-mocket/blob/master/tests/tests38/test_http_aiohttp.py

Thanks to WisdomPill for the amazing contribution.