Cargo add cv doesn't work due to old unsupported attributes.

[dogunbound]

New project, and doing cargo add cv ; cargo run will generate this error:

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> /home/dogunbound/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bitarray-0.2.6/src/lib.rs:2:1
  |
2 | #![feature(min_const_generics)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
  |
  = help: the feature `min_const_generics` has been stable since `1.51.0` and no longer requires an attribute to enable

I decided to try out master with this settings:

[dependencies.cv]
git = "https://github.com/rust-cv/cv"

And only got these warnings (atleast it is running):

[dogunbound@archlinux test-rust]$ cargo run
warning: skipping duplicate package `ensure_no_std` found at `/home/dogunbound/.cargo/git/checkouts/cv-f2802c299d0e3a2a/82a25ee/cv-geom/ensure_no_std`
warning: skipping duplicate package `ensure_no_std` found at `/home/dogunbound/.cargo/git/checkouts/cv-f2802c299d0e3a2a/82a25ee/lambda-twist/ensure_no_std`
warning: skipping duplicate package `ensure_no_std` found at `/home/dogunbound/.cargo/git/checkouts/cv-f2802c299d0e3a2a/82a25ee/akaze/ensure_no_std`
warning: skipping duplicate package `ensure_no_std` found at `/home/dogunbound/.cargo/git/checkouts/cv-f2802c299d0e3a2a/82a25ee/cv-pinhole/ensure_no_std`
warning: skipping duplicate package `ensure_no_std` found at `/home/dogunbound/.cargo/git/checkouts/cv-f2802c299d0e3a2a/82a25ee/cv-core/ensure_no_std`
    Finished dev [unoptimized + debuginfo] target(s) in 0.05s
     Running `target/debug/test-rust`

[F8RZD]

the cv cargo crate version "0.6.0" uses bitarray crate version "0.2.3".
bitarray is now at version "0.10.0"

cv/Cargo.toml

Line 43 in eba16de

bitarray = { version = "0.2.3", features = ["space"], optional = true }

I do guess they do not plan to update the crate maybe ?
my assumptions come from the way they present the build section