MSRV

This release increases log's MSRV from 1.61.0 to 1.68.0.

What's Changed

• docs: Add missing impls from README.md by @AldaronLau in #703
• Point to new URLs for favicon and logo by @AldaronLau in #704
• perf: reduce llvm-lines of FromStr for Level and LevelFilter by @dishmaker in #709
• Replace serde with serde_core by @Thomasdezeeuw in #712
• Fix clippy lints by @Thomasdezeeuw in #713
• Use GitHub Actions to install Rust and cargo-hack by @Thomasdezeeuw in #715
• Exclude old unstable_kv features from testing matrix by @Thomasdezeeuw in #716
• Fix up CI by @KodrAus in #718
• Prepare for 0.4.29 release by @KodrAus in #719

New Contributors

• @AldaronLau made their first contribution in #703
• @dishmaker made their first contribution in #709

Full Changelog: 0.4.28...0.4.29