Changed
- `orjson` now compiles on Rust stable 1.54.0 or above. Use of some SIMD
usage is now disabled by default and packagers are advised to add
`--cargo-extra-args="--features=unstable-simd"` to the `maturin build` command
if they continue to use nightly.
- `orjson` built with `--features=unstable-simd` adds UTF-8 validation
implementations that use AVX2 or SSE4.2.
- Drop support for Python 3.6.