release 1.5.0

cover special case in combine

add more golden tests for combine

minimize branches in combine logic

even faster combine

much faster combine function

address clippy warnings

add bench for combine

remove unused debug code

fix cargo fuzz link in readme

switch from afl to cargo-fuzz

more simplification for 2021 edition

use stable aarch64 intrinsics (#50)

bump rust edition to 2021 and msrv to 1.63 (#49)

add cargo categories