Readme updates

[hdholm]

Update README.md to account for recent llhttp build changes and the availability of packaged versions for FreeBSD.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (761423d) 57.60% compared to head (26bab1a) 57.60%.

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  Lines         552      552           
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  Hits          318      318           
  Misses        133      133           
  Partials      101      101           

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[hdholm]

My original thinking had been to update the README to show llhttp as the required library. But, of course, the Debian-based distros don't have it and it looks like CentOS 7 and CentOS Stream 8 don't either. CentOS Stream 9 is being built with http-parser, although llhttp is available in EPEL 9. So, now I'm thinking maybe the README should be adjusted to be clearer that it works with both. I was just trying to make it reflect recent events; I don't have a preference if someone else changes it. I'm certainly also happy to make the adjustments to the PR if that's what's preferred.

[sarroutbi]

Thanks for your change. In general, it LGTM. Requesting some minimum changes to distinguish between distributions

[sarroutbi]

Thanks for your changes. As you commented, please, change to include both dependencies according to the kind of distribution. Something like this would be enough:

Tang requires a few other software libraries:

• CentOS / Debian based distributions:

1. https-parser >= 2.8.0
2. systemd
3. jose

• Rest of distributions:

1. llhttp - ...
2. systemd
3. jose

[hdholm]

Changed to note that either http_parser or llhttp reequired. Removed systemd from the required list, since strictly speaking it's not required for stand-alone operation.

[sarroutbi]

Changes LGTM