Hello,
This pull request introduces some improvements:

CI

• Add windows-latest target (and make the CI platform independent)
• Treat msrv toolchain version as the same way as stable, beta and nightly by running also cargo test.
• drop depracated action actions-rs in favor of dtolnay/rust-toolchain

README.md MSRV

• explain how dependencies may require manual pinning for older Rust versions, like tinyvec for Rust 1.36.

Clippy

• fix Clippy complain about src/stream_safe.rs