Commits on Oct 26, 2024

1. docs(contributing): Add mdbook install note about toolchain …

   The difftastic `Cargo.toml` currently specifies Rust version 1.66 to be used.
   
   When running `cargo install mdbook` in the repository directory or manual sub-directory, the installation fails.
   
   With a more recent Rust toolchain active, which can reasonably be assumed outside of the repository directory, the mdbook installation works fine.
   
   If the user does not have a more recent toolchain active outside of the directory, the note at least serves as a pointer to the issue.
   
   ---
   
   The error in question:
   
   ```
   error: failed to compile `mdbook v0.4.40`, intermediate artifacts can be found at `[…]\Temp\cargo-install[…]`
   
   Caused by:
     failed to select a version for `env_logger`.
         ... required by package `mdbook v0.4.40`
     versions that meet the requirements `^0.11.1` are: 0.11.5, 0.11.4, 0.11.3, 0.11.2, 0.11.1
   
     the package `mdbook` depends on `env_logger`, with features: `anstream` but `env_logger` does not have these features.
      It has an optional dependency with that name, but that dependency uses the "dep:" syntax in the features table, so it does not have an implicit feature with that name.
   
     failed to select a version for `env_logger` which could resolve this conflict
   ```

   

   Kissaki committed Oct 26, 2024
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