Don't panic on unknown status codes

[mre]

Fixes #234

[pawroman]

Thinking about it, it's the most reasonable thing to do when we simply don't know what the status code might mean.

Code looks good, too. Nice little PR 👍

[mre]

Finally merged. 🎉

[fauust]

I have just hit this bug, I can confirm that the latest image from docker is correctly handling this:

❯ docker run -it lycheeverse/lychee:0.7.1 --version
lychee 0.7.1
❯ docker run -it lycheeverse/lychee:0.7.1 https://mariadb.org
⠂ 129/156 [00:00:00] ████████████████████░░░░░ ✔ https://www.continuent.com/resources/blog/testing-time-and-test-suites-managemen
thread 'tokio-runtime-worker' panicked at 'internal error: entered unreachable code', lychee-lib/src/types/status.rs:73:26
❯ docker run -it lycheeverse/lychee:latest --version
lychee 0.7.2
❯ docker run -it lycheeverse/lychee:latest https://mariadb.org
📝 Summary
---------------------
🔍 Total..........156
✅ Successful.....151
⏳ Timeouts.........0
🔀 Redirected.......0
👻 Excluded.........0
⚠ Unknown..........1
🚫 Errors...........4

[mre]

Thanks for the feedback. The only thing that irritates me is that the ⚠️ emoji is not colored in the output. I tried to fix that, but so far no luck.