atoi_simd 0.0.3

Rust fast `&str` to `i64` parser (x86_64 SIMD, SSE4.1)
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# Rust fast `&str` to `i64` parser (x86_64 SIMD, SSE4.1)

Modified [this](https://rust-malaysia.github.io/code/2020/07/11/faster-integer-parsing.html) version to support various string length and negative values.

#### You need to define the `target-cpu` for it to build with optimized performance.
For example `-e RUSTFLAGS="-C target-cpu=native"`

Maybe this would work instead: `-e RUSTFLAGS="-C target-feature=+sse2,+sse3,+sse4.1,+ssse3"`. But it hasn't been tested yet.