Update documentation to note that yore 0.3.x is not compatible with Rust 1.71.0

[theCapypara]

It seems that this commit e7f620f not only improved performance but also fixed some issue that prevents yore from running with Rust 1.71.0.

If I try to run yore 0.3.x with Rust 1.71.0 with Strings with multiple graphemes, it breaks.

use yore::code_pages::CP850;

fn main() {
    let before = CP850.encode_lossy("ß123äöü", 0x20);
    let after = CP850.decode(&before);
    dbg!(&before);
    dbg!(after);
}

Actual output:

[src/main.rs:6] &before = [
    225,
    49,
    50,
    51,
    132,
    148,
    129,
]
[src/main.rs:7] after = "\u{2}\u{1}\u{1}\u{2}thread 'main' panicked at 'byte index 12 is out of bounds of ``', library/core/src/fmt/mod.rs:2324:30
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Expected output:

[src/main.rs:6] &before = [
    225,
    49,
    50,
    51,
    132,
    148,
    129,
]
[src/main.rs:7] after = "ß123äöü"

There isn't really anything to do, since it works perfectly with 1.0, but I want to suggest maybe just adding a little note to the README about this.

[bonega]

Hey, thanks for creating the issue.
I have released a new version that contains a note about it in the changelog

[theCapypara]

Great, thanks!