Dev/update version and notes

[chifflier]

Misc changes to prepare first beta release (which will be 0.19.0-beta.1):

• Fix version number in CHANGELOG and UPGRADING files (closes UPGRADING file does not seem to apply #222)
• Update version to 0.19.0-beta.1
• chore(cargo): update dependencies time and thiserror
  • note that time depends on time-core which unfortunately requires rust 1.81, which explains the next commits
  • compatibility with our current MSRV is still possible by using a --precise flag with cargo update
• Clarify MSRV policy in README
• switch to cargo rdme, add CI checks and update links
  • this helps maintaining src/lib.rs and README.md in sync

[chifflier]

@cpu ping? I do not mean to hurry. I totally understand if you do not have time, just tell me :)

[cpu]

Thanks for the ping and sorry for letting it sit without a reply! I'm a bit more over-subscribed than usual this week and probably won't have a chance to look at it until ~next. You don't have to wait for me of course if that's too long to wait.

[dns2utf8]

Quick question, is the code in this PR what landed in the 0.18 release?

Thank you all

[chifflier]

Hi @cpu,
Gentle ping for this PR review

Quick question, is the code in this PR what landed in the 0.18 release?
Yes (and more). This is mostly merging the entry for 0.18.0 in CHANGELOG.md, and then bumping version for master (next release planned is 0.19.0-beta.1)

[cpu]

Thanks for the ping and apologies for letting this fall off my radar! Here's some initial feedback.

[chifflier]

Ok, so, I do not really like that but I had to include a few other changes in the PR to fix urgent problems and attempt to have a cleaner CI
There is still an issue with cargo-rdme and nightly version. Geez, this is annoying

[chifflier]

Ok, so, cargo-rdme pushed a fix/workaround, so everything should be fine now! CI is green 🎉
@cpu : would you have some time to review this? This PR is blocking several others and it is becoming urgent
Thanks in advance

[cpu]

I haven't done an extensive review but I think given how long this has been blocked it makes sense to merge + iterate if anything new pops up.

[chifflier]

Thank you for the quick review!
I will now merge changes (including a revert to MSRV 1.85 as discussed) and close this
Let's use other issues/PRs if there is anything to discuss

[cpu]

Great! Thanks :-)