v0.3.2

This version mostly updated all the dependencies and switched to using Rust edition 2021. The minimum supported Rust version is still 1.56.1, as it was before.

The unmaintained buf_redux was replaced by the modernized fork buffer_redux (fixes #15).

In addition, a4c50de adds some #[inline] statements, which may improve performance in non-LTO builds (but there dignifiedquire/buffer-redux#2 still requiring LTO for maximum performance).