Clippy, dependencies bump, readme fixes

[virtualritz]

• Ran clippy --fix, some manual reverts, see (clippy#11461).
• Bumped dependencies where possible w/o code changes.
• Fixed the Markdown files (MD syntax, headline capitalization, typography, grammar).

[virtualritz]

P.S.: thank you for this great tool!!!

[cytrinox]

Thanks for your contribution @virtualritz.
Please strip out clippy fixes, as they make some code lines less readable, thanks.

[virtualritz]

Please strip out clippy fixes, as they make some code lines less readable, thanks.

I think these came probably from cargo fmt, not clippy --fix. Can you tell me which ones (an example is enough)?

I would then rather add more rustfmt.toml settings that guarantee that cargo fmt generates formatting that you like.

On that note: most crates I contributed to in the last year now make running cargo fmt mandatory before submitting a PR, so I just do that out of habit now.