Update chapter02.md

[MajesticTwelve12]

Changed let secret_number = rand::thread_rng().gen_range(1..=100); and gen_range() are depracted since 0.9.0 and should use let secret_number = rand::rng().random_range(1..=100);

Sources

https://docs.rs/rand/latest/rand/fn.thread_rng.html
https://docs.rs/rand/latest/rand/trait.Rng.html#method.gen_range

[dnetguru]

I think this is important to merge since the introduction states:

This version of the text assumes you’re using Rust 1.85.0 (released 2025-02-17) or later with edition = "2024"

and these changes to the rand library were made due to conflicts with newly reserved gen keyword in the 2024 edition.

However, the earlier section adding rand = "0.8.5" as a dependency and later upgrading it to rand = "0.9.0" should probably be also modified not to cross the 0.9.0 version since that is where the rename took effect (along with the relevant outputs of cargo build and cargo update runs). It could use 0.9.0 initially and later upgrade to 0.9.2 as an example.

[carols10cents]

This is a duplicate of #4254. Thanks though!