build fails on recent versions of rustc nightly

[tomtau]

e.g. rustc 1.44.0-nightly (f509b26a7 2020-03-18)

error[E0658]: use of unstable library feature 'stdsimd'
   --> src/platform.rs:304:12
    |
304 |         if is_x86_feature_detected!("avx512f") && is_x86_feature_detected!("avx512vl") {
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
    = help: add `#![feature(stdsimd)]` to the crate attributes to enable
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.
error: could not compile `blake3`.

[oconnor663]

This bug was fixed on more recent nightlies. Can you update?

[oconnor663]

#57

[tomtau]

It's possible to update with

rustup set profile minimal

as recent nightlies miss certain components