volatile 0.4.1

A simple volatile wrapper type
# Unreleased

# 0.4.1 – 2020-09-21

- Small documentation and metadata improvements

# 0.4.0 – 2020-09-21

- Rewrite crate to operate on reference values ([#13]https://github.com/rust-osdev/volatile/pull/13)

# 0.3.0 – 2020-07-29

- **Breaking:** Remove `Debug` and `Clone` derives for `WriteOnly` ([#12]https://github.com/rust-osdev/volatile/pull/12)

# 0.2.7 – 2020-07-29

- Derive `Default` for `Volatile`, `WriteOnly` and `ReadOnly` ([#10]https://github.com/embed-rs/volatile/pull/10)