Add FreeBSD support

[LukaszMoskala]

Closes issue #17

Checklist

• Pull request details were added to CHANGELOG.rst
• Documentation was updated (if needed)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (918d159) 98.32% compared to head (e7c358b) 98.32%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #18   +/-   ##
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  Coverage    98.32%   98.32%           
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  Files            2        2           
  Lines          239      239           
  Branches        62       62           
========================================
  Hits           235      235           
  Misses           2        2           
  Partials         2        2           

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[rhpvorderman]

Thanks! I will merge this as soon as the tests pass.

[gdt]

Thanks for submitting and merging this! I tried to update Home Assistant to 2023.12, on NetBSD, and failed. I have not gotten around to figuring out how to fix. I just tried again with 2023.12.4, wondering if it had been addressed and was very pleasantly surprised -- the pip upgrade finished straigthforwardly and my instance is running fine.

I also wonder if the Unix (POSIX?) branch should simply be "if not windows and if not mac", rather than an explicit list, but with bsd in the code, it's working for me.

[rhpvorderman]

There is also stuff like OS/2, android, iOS. So it has to be a little bit more explicit ;-).