specify edition "2018" in Cargo.toml

[NewGyu]

Hello, I'm a rust beginer. vscode-remote-containers is so useful, I love it.

I'm learning rust-lang according to the official tutorial. https://doc.rust-lang.org/book/ch02-00-guessing-game-tutorial.html

I started programing based on this repository because I love VSCode + remote container, but unresolved import error was occurred when adding use rand::Rng;. It was required to specify extern crate when edition is omitted in Cargo.toml.

I think It is good that edition "2018" is specified in Cargo.toml for the developers who try rust-lang with this remote-containers source code example.

Thank you.

[ghost]

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