v5.1.0

What's Changed

• improve performance of _get_free_channel_id, fix channel max bug by @pawl in #385
• document memoryview usage, minor frame_writer.write_frame refactor by @pawl in #384
• update tidelift alignment config CI by @auvipy in #375
• start dropping python 3.6 by @auvipy in #387
• adding experimental slots to some classes by @auvipy in #368
• try pytest 7 by @auvipy in #388

Full Changelog: v5.0.9...v5.1.0