version 1.5.0

Changes since 1.4.1:

• The Rust crate's Hasher type has gained new helper methods for common forms of IO: update_reader, update_mmap, and update_mmap_rayon. The latter matches the default behavior of b3sum. The mmap methods are gated by the new "mmap" Cargo feature.
• Most of the Rust crate's public types now implement the Zeroize trait. This is gated by the new "zeroize" Cargo feature.
• The Rust crate's Hash types now implements the serde Serialize and Deserialize traits. This is gated by the new "serde" Cargo feature.
• The C library now uses atomics to cache detected CPU features under most compilers other than MSVC. Previously this was a non-atomic write, which was probably "benign" but made TSan unhappy.
• NEON support is now disabled by default on big-endian AArch64. Previously this was a build error if the caller didn't explicitly disable it.