Update Cargo.toml

[paulpr0]

Hi, thanks for building this - it looks useful so I thought I'd give it a try. I was on a slightly older version of rust on some machines, and got an error whilst building.

io_error_more seems to have been stabalised in 1.82. (rust-lang/rust#131396)

Compiling with 1.80 I get:

error[E0658]: use of unstable library feature 'io_error_more'
   --> C:\Users\paul\.cargo\registry\src\index.crates.io-6f17d22bba15001f\quicknotes-1.0.1\src/lib.rs:412:17
    |
412 |                 io::ErrorKind::IsADirectory,
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #86442 <https://github.com/rust-lang/rust/issues/86442> for more information

[ollien]

Thank you for spotting this!

Unless I'm mistaken, I think the MSRV would have to be rust 1.83 then; IsADirectory was stabilized then. Could you update this?

https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.IsADirectory

[paulpr0]

Good point. Done :-)