atty potential unaligned read #9

[Martin1887]

On windows, atty dereferences a potentially unaligned pointer.

In practice however, the pointer won't be unaligned unless a custom global allocator is used.

In particular, the System allocator on windows uses HeapAlloc, which guarantees a large enough alignment.

To fix this, there are two alternatives:

• https://crates.io/crates/is-terminal
• https://doc.rust-lang.org/stable/std/io/trait.IsTerminal.html (requiring upgrade the minimum Rust version to 1.70).

This is a low risk vulnerability but it should be fixed. This is a dependency of criterion and clap, so the versions of these crates must be checked.