Birdisle

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- Fix ``from_url``
- Fix a segfault if small integers are stored in the database at shutdown
- Clarify that only Linux with glibc is supported

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- Update vendored birdisle to redis 5.0.12
- Drop support for Python versions older than 3.6
- Remove use of async_generator
- Support the latest redis-py, and require at least 3.4.1
- Pin aioredis to versions less than 2 (2.x is not currently supported)
- Build wheels for newer Python versions (up to 3.10)
- Switch from Travis CI to Github Actions
- Remove mkwheel.sh and rely on cibuildwheel instead
- Remove use of loop arguments where Python 3.10 no longer supports them
- Fix a log message with an extraneous %s
- Stop using deprecated ``locale.format_string``

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- Update vendored birdisle to redis 5.0.3

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- Support redis-py 3.0
- Update vendored birdisle (reduces memory usage)

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- Update README.md
- Add coverage measurement with coveralls

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This is the first release.