fs4 0.13.0

No libc, pure Rust cross-platform file locks. Original fs2, now supports async and replace libc by rustix.
Documentation 
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# Releases

## 0.13.0

### Breakage

- Make `try_lock_*` returns `std::io::Result<bool>`, which is compatible with the incoming `std::fs::File::try_lock*` in std liberary.