[Docs Request] State Rust version requirements (1.63) explicitly

[koachan]

Hello, I'm having errors when trying to build it on my machine, using Rust 1.62.1 on Gentoo.

error[E0658]: use of unstable library feature 'scoped_threads'
  --> src/main.rs:36:5
   |
36 |     std::thread::scope(|s| {
   |     ^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #93203 <https://github.com/rust-lang/rust/issues/93203> for more information

error[E0658]: use of unstable library feature 'scoped_threads'
  --> src/main.rs:38:11
   |
38 |         s.spawn(|| {
   |           ^^^^^
   |
   = note: see issue #93203 <https://github.com/rust-lang/rust/issues/93203> for more information

error[E0658]: use of unstable library feature 'scoped_threads'
  --> src/main.rs:50:11
   |
50 |         s.spawn(|| {
   |           ^^^^^
   |
   = note: see issue #93203 <https://github.com/rust-lang/rust/issues/93203> for more information

error[E0658]: use of unstable library feature 'scoped_threads'
  --> src/main.rs:68:10
   |
68 |         .join()
   |          ^^^^
   |
   = note: see issue #93203 <https://github.com/rust-lang/rust/issues/93203> for more information

For more information about this error, try `rustc --explain E0658`.
error: could not compile `core-to-core-latency` due to 4 previous errors

Seems like it uses a feature that only starts becoming available in Rust 1.63, so I suppose this could be stated explicitly in the readme file?

[nviennot]

Let me rewrite the code without using such feature

[nviennot]

Okay, I've pushed a new version that only requires Rust 1.57. I've added a badge on the README

[koachan]

Thanks a lot!